UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-Q


[ X ]	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2006
	OR
[ ]	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _________________ to _______________________

Commission file number: 000-22427

HESKA CORPORATION
(Exact name of registrant as specified in its charter)

Delaware	77-0192527
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification Number)

3760 Rocky Mountain Avenue
Loveland, Colorado	80538
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (970) 493-7272

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
Yes [ X ] No [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):
Large Accelerated Filer [ ] Acclerated Filer [ ] Non-accelerated Filer [ X ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Yes [ ] No [ X ]

The number of shares of the Registrant’s Common Stock, $.001 par value, outstanding at May 12, 2006 was 50,252,928

		Page
PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements:
	Condensed Consolidated Balance Sheets (Unaudited) as of December 31, 2005 and March 31, 2006	2
	Condensed Consolidated Statements of Operations (Unaudited) for the three months ended March 31, 2005 and 2006	3
	Condensed Consolidated Statements of Cash Flows (Unaudited) for the three months ended March 31, 2005 and 2006	4
	Notes to Condensed Consolidated Financial Statements (Unaudited)	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	11
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	22
Item 4.	Controls and Procedures	22
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	24
Item 1A.	Risk Factors	24
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3.	Defaults Upon Senior Securities	34
Item 4.	Submission of Matters to a Vote of Security Holders	34
Item 5.	Other Information	34
Item 6.	Exhibits	35
Signatures		36

i-STAT is a registered trademark of Abbott Laboratories. SPOTCHEM is a trademark of Arkray, Inc. TRI-HEART is a registered trademark of Schering-Plough Animal Health Corporation (“SPAH”) in the United States and is a trademark of Heska Corporation in other countries. HESKA, ALLERCEPT, AVERT, E.R.D.-HEALTHSCREEN, E-SCREEN, FELINE ULTRANASAL, SOLO STEP and VET/OX are registered trademarks and CBC-DIFF, ERD, G2 DIGITAL, THYROMED and VET/IV are trademarks of Heska Corporation in the United States and/or other countries. This 10-Q also refers to trademarks and trade names of other organizations.

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(dollars in thousands except per share amounts)
(unaudited)

ASSETS
	December 31, 2005		March 31, 2006

Current assets:
Cash and cash equivalents	$	5,231	$	5,029
Accounts receivable, net of allowance for doubtful accounts of $88 and $92, respectively		9,008		8,322
Inventories, net		11,654		12,561
Other current assets		952		853

Total current assets		26,845		26,765
Property and equipment, net		7,428		7,125
Intangible assets, net		1,529		1,378
Goodwill		714		712
Deferred tax asset, net of current portion		110		89
Other assets		158		158

Total assets	$	36,784	$	36,227

LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	5,186		$	5,906
Accrued liabilities		1,908			2,445
Current portion of deferred revenue		2,912			2,714
Line of credit		9,453			8,385
Current portion of long-term debt and capital leases		1,263			1,292

Total current liabilities		20,722			20,742
Long-term debt and capital leases, net of current portion		2,703			2,509
Deferred revenue, net of current portion, and other		10,126			9,781

Total liabilities		33,551			33,032

Commitments and contingencies
Stockholders’equity:
Preferred stock, $.001 par value, 25,000,000 shares authorized; none issued or outstanding		--			--
Common stock, $.001 par value, 75,000,000 shares authorized; 50,042,355 and 50,217,435 shares issued and outstanding, respectively		50			50
Additional paid-in capital		213,054			213,274
Accumulated other comprehensive income (loss)		(47	)		(66	)
Accumulated deficit		(209,824	)		(210,063	)

Total stockholders’equity		3,233			3,195

Total liabilities and stockholders’ equity	$	36,784		$	36,227

See accompanying notes to condensed consolidated financial statements.

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)
(unaudited)


	Three Months Ended March 31,
	2005			2006

Revenue, net:
Product revenue, net:
Core companion animal health	$	12,856		$	14,259
Other vaccines, pharmaceuticals and products		3,980			2,709

Total product revenue, net		16,836			16,968
Research, development and other		318			532

Total revenue		17,154			17,500

Cost of revenue:
Cost of products sold		11,057			10,212
Cost of research, development and other		179			435

Total cost of revenue		11,236			10,647

Gross profit		5,918			6,853

Operating expenses:
Selling and marketing		3,799			3,674
Research and development		1,227			745
General and administrative		1,995			2,392

Total operating expenses		7,021			6,811

Income (loss) from operations		(1,103	)		42
Interest and other expense, net		205			260

Income (loss) before income taxes		(1,308	)		(218	)
Income tax expense		--			21

Net income (loss)	$	(1,308	)	$	(239	)

Basic and diluted net income (loss) per share	$	(0.03	)	$	(0.00	)

Weighted average shares used to compute basic and diluted net income (loss) per share		49,375			50,126

See accompanying notes to condensed consolidated financial statements.

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
(unaudited)

	Three Months Ended March 31,

	2005			2006

CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net loss	$	(1,308	)	$	(239	)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization		471			422
Amortization of intangible assets		40			216
Deferred tax expense (benefit)		--			21
Stock based compensation		21			57
Unrealized (gain) on foreign currency translation		--			(22	)
Changes in operating assets and liabilities:
Accounts receivable		802			686
Inventories		216			(907	)
Other current assets		183			100
Accounts payable		696			720
Accrued liabilities		35			537
Deferred revenue and other long-term liabilities		(834	)		(543	)
Other		2			(1	)

Net cash provided by (used in) operating activities		324			1,047

CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment		(666	)		(118	)
Capitalized patent costs		(60	)		(65	)

Net cash provided by (used in) investing activities		(726	)		(183	)

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock		90			162
Proceeds from (repayments of) line of credit borrowings, net		207			(1,068	)
Proceeds from (repayments of) debt and capital lease obligations		(87	)		(165	)

Net cash provided by (used in) financing activities		210			(1,071	)

EFFECT OF EXCHANGE RATE CHANGES ON CASH		(100	)		5

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(292	)		(202	)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		4,982			5,231

CASH AND CASH EQUIVALENTS, END OF PERIOD	$	4,690		$	5,029

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	$	212		$	312

See accompanying notes to condensed consolidated financial statements.

HESKA CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
March 31, 2006
(UNAUDITED)

1. ORGANIZATION AND BUSINESS

Heska Corporation (“Heska” or the “Company”) discovers, develops, manufactures, markets, sells, distributes and supports veterinary products. Heska’s core focus is on the canine and feline companion animal health markets. The Company has devoted substantial resources to the research and development of innovative products in these areas, where it strives to provide high value products for unmet needs and advance the state of veterinary medicine.

Heska is comprised of two reportable segments, Core Companion Animal Health and Other Vaccines, Pharmaceuticals and Products. The Core Companion Animal Health segment includes diagnostic and monitoring instruments and supplies as well as single use diagnostic and other tests, pharmaceuticals and vaccines, primarily for canine and feline use. These products are sold directly by the Company as well as through independent third party distributors and other distribution relationships. The Other Vaccines, Pharmaceuticals and Products segment (“OVP”), previously reported as the Diamond Animal Health segment, includes private label vaccine and pharmaceutical production, primarily for cattle but also for other animals including small mammals, horses and fish. All OVP products are sold by third parties under third party labels.

Cumulative net losses from inception of the Company in 1988 through March 31, 2006, have totaled $210.1 million. During the three months ended March 31, 2006, the Company recorded a net loss of approximately $239 thousand and operations provided cash of approximately $1.0 million. The Company’s ability to achieve sustained profitable operations will depend primarily upon its ability to successfully market its products and commercialize new products. There can be no guarantee that the Company will be successful in these endeavors or attain quarterly, annual, or sustained profitability in the future.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements are the responsibility of the Company’s management and have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and pursuant to the instructions to Form 10-Q and rules and regulations of the Securities and Exchange Commission (the “SEC”). The condensed consolidated balance sheet as of March 31, 2006, the condensed consolidated statements of operations for the three months ended March 31, 2005 and 2006 and the condensed consolidated statements of cash flows for the three months ended March 31, 2005 and 2006 are unaudited, but include, in the opinion of management, all adjustments (consisting of normal recurring adjustments) which the Company considers necessary for a fair presentation of its financial position, operating results and cash flows for the periods presented. All material intercompany transactions and balances have been eliminated in consolidation. Although the Company believes that the disclosures in these financial statements are adequate to make the information presented not misleading, certain information and footnote disclosures normally included in complete financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the SEC.

Results for any interim period are not necessarily indicative of results for any future interim period or for the entire year. The accompanying financial statements and related disclosures have been prepared with the presumption that users of the interim financial information have read or have access to the audited financial

statements for the preceding fiscal year. Accordingly, these financial statements should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2005, included in the Company’s Annual Report on Form 10-K filed with the SEC on March 31, 2006.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reported period. Actual results could differ from those estimates. Significant estimates are required when establishing the allowance for doubtful accounts and the provision for excess/obsolete inventory, in determining the period over which the Company’s obligations are fulfilled under agreements to license product rights and/or technology rights, in determining the need for a valuation allowance on certain deferred tax assets and in evaluating long-lived assets for impairment.

Inventories

Inventories are stated at the lower of cost or market using the first-in, first-out method. Inventory manufactured by the Company includes the cost of material, labor and overhead. If the cost of inventories exceeds estimated fair value, provisions are made to reduce the carrying value to fair value.

Inventories, net consist of the following (in thousands):

	December 31, 2005			March 31, 2006

Raw materials	$	3,002		$	3,214
Work in process		3,090			3,486
Finished goods		6,318			6,642
Allowance for excess or obsolete inventory		(756	)		(781	)

	$	11,654		$	12,561

Basic and Diluted Net Income (Loss) Per Share

Basic net income (loss) per common share is computed using the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the sum of the weighted average number of shares of common stock outstanding, and, if not anti-dilutive, the effect of outstanding common stock equivalents (such as stock options and warrants) determined using the treasury stock method. Due to the Company’s net losses for the three months ended March 31, 2005 and 2006, all potentially dilutive securities were anti-dilutive and as a result, basic net loss per share is the same as diluted net loss per share for those periods. For the three months ended March 31, 2005 and 2006, securities that have been excluded from diluted net loss per share because they would be anti-dilutive are outstanding options to purchase 11,224,247 and 11,812,995 shares, respectively.

Stock Based Compensation

Effective January 1, 2006, the Company adopted Statement of Financial Accounting Standards No. 123 “Share Based Payments” (“SFAS No. 123R”) under the modified prospective method of adoption. Prior to January 1, 2006, the Company accounted for its stock-based compensation plans using the intrinsic value method in accordance with Accounting Principles Board Opinion No. 25, “Accounting for Stock Issued to Employees” (“APB No. 25”), and related interpretations, and followed the disclosure provisions of SFAS No. 123, “Accounting for Stock-Based Compensation” (“SFAS No. 123”) and SFAS No. 148, “Accounting for Stock-

Based Compensation - Transition and Disclosure” (“SFAS No. 148”). See Note 3 “Capital Stock” below for further information on stock based compensation.

3. CAPITAL STOCK

Adoption of New Standard

The Company adopted SFAS 123R effective January 1, 2006 under the modified prospective method of adoption. This pronouncement requires companies to measure the cost of employee services received in exchange for an award of equity instruments (including stock options) based on the grant-date fair value of the award. The fair value is estimated using option-pricing models where applicable. The resulting cost is recognized over the period during which an employee is required to provide service in exchange for the award, usually the vesting period. This represents a change in accounting for the Company’s stock option plans and employee stock purchase plan. Prior to the Company’s adoption of SFAS No. 123R on January 1, 2006, the Company measured stock-based compensation under the intrinsic value based method of APB No. 25 with pro forma disclosures of net income or loss assuming the fair value method of SFAS No. 123, which became effective in 1996, had been applied. Any accounting difference between SFAS No. 123R and SFAS No. 123, as historically applied by the Company, shall be defined as the “123R Effect”.

The Company recorded compensation expense of approximately $21 thousand related to the Company’s stock for the three months ended March 31, 2005. During the three months ended March 31, 2006, the 123R Effect reduced the Company’s income from continuing operations, income before income taxes and net income by approximately $57 thousand but did not have a material impact on the Company’s basic and diluted earnings per share. There was no 123R Effect on the Company’s cash flow from operations and cash flow from financing line items as the Company believes its net operating loss carryforwards (“NOLs”) are not realizable on a more-likely-than-not basis, and accordingly, any NOL-related deferred tax assets must be completely offset by an equal valuation allowance. Had compensation expense for the Company’s stock-based compensation plans been based on fair value at the grant dates, consistent with the methodology of SFAS No. 123, the Company’s net income (loss) and net income (loss) per share for the three months ended March 31, 2005 would approximate the pro forma amounts as follows:

	Three Months Ended March 31, 2005

	(in thousands, except per share amounts)
Net income (loss) as reported	$	(1,308	)
Stock-based employee compensation expense included in the determination of net income (loss), as reported		21
Stock-based employee compensation expense, as if the fair value based method had been applied to all awards		(1,685	)

Net income (loss), pro forma	$	(2,972	)

Net income (loss) per share:
Basic and diluted - as reported	$	(0.03	)

Basic and diluted - pro forma	$	(0.06	)

On February 24, 2005, the Company’s Board of Directors considered the significant impact that the use of fair values, rather than intrinsic values, would have on the Company’s future results of operations, as well as factors including that the management team had requested that their salaries be frozen for 2005, many non-management employees’ 2005 raises were to be at below market levels, no management bonus payments were made for 2004 and the 2005 management incentive plan called for a performance in excess of the Company’s internal budget before any bonus payments were to be made, and authorized the Company’s Stock Option Committee, which consisted solely of the Company’s Chief Executive Officer, to accelerate the vesting of any outstanding but unvested stock options with a strike price that was not “in-the-money” through June 30, 2005 at

its discretion. On March 30, 2005, the Company’s Stock Option Committee exercised its discretion and accelerated the vesting of outstanding but unvested stock options with a strike price greater than or equal to $0.82. This action effected approximately 750 thousand options, approximately 55 thousand of which were held by the Company’s Directors and Executive Officers. These options were not “in-the-money” at that time, and therefore, there was no compensation expense recorded in accordance with APB No. 25 as a result of this modification. However, for pro forma purposes in accordance with SFAS No. 123, the remaining unamortized compensation expense related to these options, calculated under SFAS No. 123 of approximately $540 thousand was recorded in the first quarter of 2005 and included in the table above. In addition, options to purchase approximately 2.0 million shares were granted with immediate vesting on March 30, 2005 and March 31, 2005 combined.

The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-pricing model, with the following weighted average assumptions for options granted in the three months ended March 31, 2005 and March 31, 2006. The estimated total fair value of the options granted during the three months ended March 31, 2005 was approximatelly $1.0 million. The estimated total fair value of the options granted during the three months ended March 31, 2006 was approximately $16 thousand.

	Three Months Ended March 31,

	2005		2006

Risk-free interest rate		4.07%		4.74%
Expected lives		2.9 years		2.0 years
Expected volatility		86%		71%
Expected dividend yield		0%		0%

A summary of the Company’s stock option plans is as follows:

	Year Ended December 31,					Three Months Ended March 31,
	2005					2006

	Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price

Outstanding at beginning of period		9,350,959		$	1.4509		11,989,582		$	1.3251
Granted at market		3,999,897		$	1.0130		28,914		$	1.4122
Granted above market		--		$	--		--		$	--
Cancelled		(821,161	)	$	1.6345		(30,421	)	$	1.8368
Exercised		(540,113	)	$	0.7222		(175,080	)	$	0.9101

Outstanding at end of period		11,989,582		$	1.3251		11,812,995		$	1.3301

Exercisable at end of period		11,765,335		$	1.3373		11,664,788		$	1.3394

The following table summarizes information about stock options outstanding and exercisable at March 31, 2006:

	Options Outstanding						Options Exercisable

Exercise Prices	Number of Options Outstanding at March 31, 2006		Weighted Average Remaining Contractual Life in Years		Weighted Average Exercise Price		Number of Options Exercisable at March 31, 2006		Weighted Average Exercise Price

$0.34 - $0.87		2,097,848		6.90	$	0.6425		1,949,641	$	0.6394
$0.88 - $0.95		2,468,219		8.49	$	0.8975		2,468,219	$	0.8975
$0.99 - $1.24		2,108,053		5.36	$	1.1283		2,108,053	$	1.1283
$1.25 - $1.58		2,292,117		8.50	$	1.2987		2,292,117	$	1.2987
$1.59 - $13.75		2,846,758		6.84	$	2.3866		2,846,758	$	2.3866

$0.34 - $13.75		11,812,995		7.25	$	1.3301		11,664,788	$	1.3394

4. SEGMENT REPORTING

The Company is comprised of two reportable segments, Core Companion Animal Health (“CCA”) and Other Vaccines, Pharmaceuticals and Products (“OVP”). The Core Companion Animal Health segment includes diagnostic and monitoring instruments and supplies, as well as single use, stand alone diagnostic and other tests, pharmaceuticals and vaccines, primarily for canine and feline use. These products are sold directly by the Company as well as through independent third party distributors and other distribution relationships. Core Companion Animal Health segment products manufactured at the Des Moines, Iowa production facility included in OVP’s assets are transferred at cost and are not recorded as revenue for OVP. The Other Vaccines, Pharmaceuticals and Products segment includes private label vaccine and pharmaceutical production, primarily for cattle, but also for other animals including small mammals, horses and fish. All OVP products are sold by third parties under third party labels.

Additionally, the Company generates non-product revenue from research and development services for third parties, licensing of technology product rights and royalties. The Company performs these research and development services for both companion animal and livestock purposes.

Summarized financial information concerning the Company’s reportable segments is shown in the following table (in thousands):

	Core Companion Animal Health			Other Vaccines, Pharmaceuticals and Products		Total

Three Months Ended March 31, 2005:
Total revenue	$	13,132		$	4,022	$	17,154
Operating income (loss)		(1,612	)		509		(1,103	)
Total assets		23,029			14,443		37,472
Capital expenditures		332			334		666
Depreciation and amortization		183			288		471
Amortization of intangible assets		40			--		40
Interest expense		147			86		233

Three Months Ended March 31, 2006:
Total revenue	$	14,731		$	2,769	$	17,500
Operating income (loss)		(160	)		202		42
Total assets		20,558			15,669		36,227
Capital expenditures		95			23		118
Depreciation and amortization		187			235		422
Amortization of intangible assets		216			--		216
Interest expense		205			114		319

5. COMPREHENSIVE INCOME (LOSS)

Comprehensive income (loss) includes net income (loss) plus the results of certain stockholders’ equity changes not reflected in the Condensed Consolidated Statements of Operations. Such changes primarily include foreign currency translation items. Total comprehensive loss for the three months ended March 31, 2005 was $1.3 million and total comprehensive loss for the three months ended March 31, 2006 was $258 thousand.

Item 2.

MANAGEMENT’S DISCUSSION AND ANALYSIS
OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with “Selected Consolidated Financial Data” and the Unaudited Condensed Consolidated Financial Statements and related Notes included in Item 1 of this Form 10-Q.

This discussion contains forward-looking statements that involve risks and uncertainties. Such statements, which include statements concerning future revenue sources and concentration, gross profit margins, selling and marketing expenses, research and development expenses, general and administrative expenses, capital resources, additional financings or borrowings and additional losses, are subject to risks and uncertainties, including, but not limited to, those discussed below and elsewhere in this Form 10-Q, particularly in Item 1A. “Risk Factors,” that could cause actual results to differ materially from those projected. The forward-looking statements set forth in this Form 10-Q are as of May 15, 2006, and we undertake no duty to update this information.

Overview

We discover, develop, manufacture, market, sell, distribute and support veterinary products. Our business is comprised of two reportable segments, Core Companion Animal Health, which represented 81% and 84% of our product revenue for 2005 and the three months ended March 31, 2006, respectively, and Other Vaccines, Pharmaceuticals and Products, which represented 19% and 16% of our product revenue for 2005 and the three months ended March 31, 2006, respectively.

The Core Companion Animal Health segment includes diagnostic and monitoring instruments and supplies as well as single use, diagnostic and other tests, pharmaceuticals and vaccines, primarily for canine and feline use.

Diagnostic and monitoring instruments and supplies represented approximately 45% and 45% of our product revenue for 2005 and the three months ended March 31, 2006. Many products in this area involve placing an instrument in the field and generating future revenue from consumables, including items such as supplies and service, as that instrument is used. A loss of or disruption in supply of consumables we are selling to an installed base of instruments could substantially harm our business. Major products in this area include our handheld electrolyte instrument, our chemistry instrument and our hematology instrument and their affiliated consumables. All products in this area are supplied by third parties, who typically own the product rights and supply the product to us under marketing and/or distribution agreements. In many cases, we have collaborated with a third party to adapt a human instrument for veterinary use.

Single use, diagnostic and other tests, vaccines and pharmaceuticals represented approximately 36% and 39%, respectively, of our product revenue for both 2005 and the three months ended March 31, 2006. Since items in this area are single use by their nature, our aim is to build customer satisfaction and loyalty for each product, generate repeat annual sales from existing customers and expand our customer base in the future. Major products in this area include our heartworm diagnostic tests, our heartworm preventive, our allergy diagnostic tests and our allergy immunotherapy. Products in this area are both supplied by third parties and provided by us.

We consider the Core Companion Animal Health segment to be our core business and devote most of our management time and other resources to improving the prospects for this segment. Maintaining a continuing, reliable and economic supply of products we currently obtain from third parties is critical to our success in this area. Virtually all of our sales and marketing expenses are in the Core Companion Animal Health segment. The majority of our research and development spending is dedicated to this segment, as well. We have devoted

substantial resources to the research and development of innovative products in Core Companion Animal Health, where we strive to provide high value products for unmet needs and advance the state of veterinary medicine.

All our Core Companion Animal Health products are ultimately sold to or through veterinarians. In many cases, veterinarians will markup their costs to the end user. The acceptance of our products by veterinarians is critical to our success. Core Companion Animal Health products are sold directly by us as well as through independent third party distributors and other distribution relationships. We believe that one of our largest competitors, IDEXX Laboratories, Inc. (“IDEXX”), effectively prohibits its distributors from selling competitors’ products, including our diagnostic instruments and heartworm diagnostic tests. We believe the IDEXX restrictions limit our ability to engage national distributors to sell our full line of products and significantly restrict our ability to market our products to veterinarians.

While we have decreased our operating expenses in the first three months of 2006 as compared to the corresponding period in 2005, we anticipate we will have higher operating expenses for full year 2006 than we did for full year 2005 and expect operating expenses to increase as we grow our business in the intermediate term. We intend to reach sustained profitability through a combination of revenue growth, gross margin improvement and expense control. Accordingly, we closely monitor product revenue growth trends in our Core Companion Animal Health segment. Product revenue for this segment grew 11% for the three months ended March 31, 2006 as compared to the corresponding 2005 period. Product revenue in our Core Companion Animal Health segment grew 4% in 2005 as compared to 2004 and has grown at a compounded annual growth rate of 20% since 1998, our first full year as a public company.

The Other Vaccines, Pharmaceuticals and Products segment (“OVP”) includes our 168 thousand square foot USDA- and FDA-licensed production facility in Des Moines, Iowa. We view this facility as a strategic asset which will allow us to control our cost of goods on any vaccines and pharmaceuticals that we may commercialize in the future. We are increasingly integrating this facility with our operations elsewhere. For example, virtually all our U.S. inventory is now stored at this facility and fulfillment logistics are managed there. Core Companion Animal Health segment products manufactured at this facility are transferred at cost and are not recorded as revenue for our OVP segment. We view OVP reported revenue as revenue primarily to cover the overhead costs of the facility and to generate incremental cash flow to fund our Core Companion Animal Health segment.

Our OVP segment includes private label vaccine and pharmaceutical production, primarily for cattle but also for other animals including small mammals, horses and fish. All OVP products are sold by third parties under third party labels.

We have developed our own line of bovine vaccines that are licensed by the USDA. We have a long-term agreement with a distributor, Agri Laboratories, Ltd., (“AgriLabs”), for the marketing and sale of certain of these vaccines which are sold primarily under the Titanium® and MasterGuard® brands which are registered trademarks of AgriLabs. This agreement generates a significant portion of OVP segment’s revenue. Subject to certain purchase minimums, under our long-term agreement, AgriLabs has the exclusive right to sell the aforementioned bovine vaccines in the United States, Africa, China, Mexico and Taiwan until at least December 2009. This exclusivity may be extended under certain conditions. Our OVP segment also produces vaccines and pharmaceuticals for other third parties.

Additionally, we generate non-product revenues from research and development services for third parties, licensing of technology product rights and royalties. We perform these research and development services for both companion animal and livestock product purposes.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations is based upon the consolidated financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of financial statements in conformity with GAAP requires

management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenue and expense during the periods. These estimates are based on historical experience and various other assumptions that we believe to be reasonable under the circumstances. We have identified those critical accounting policies used in reporting our financial position and results of operations based upon a consideration of those accounting policies that involve the most complex or subjective decisions or assessment. We consider the following to be our critical policies.

Revenue Recognition

We generate our revenue through the sale of products, licensing of technology product rights, royalties and sponsored research and development. Our policy is to recognize revenue when the applicable revenue recognition criteria have been met, which generally include the following:

•

Persuasive evidence of an arrangement exists;

•

Delivery has occurred or services rendered;

•

Price is fixed or determinable; and

•

Collectibility is reasonably assured.

Revenue from the sale of products is recognized after both the goods are shipped to the customer and acceptance has been received, if required, with an appropriate provision for estimated returns and allowances. We do not permit general returns of products sold. Certain of our products have expiration dates. Our policy is to exchange certain outdated, expired product with the same product. We record an accrual for the estimated cost of replacing the expired product expected to be returned in the future, based on our historical experience, adjusted for any known factors that reasonably could be expected to change historical patterns, such as regulatory actions which allow us to extend the shelf lives of our products. Revenue from both direct sales to veterinarians and sales to independent third-party distributors are generally recognized when goods are shipped. Our products are shipped complete and ready to use by the customer. The terms of the customer arrangements generally pass title and risk of ownership to the customer at the time of shipment. Certain customer arrangements provide for acceptance provisions. Revenue for these arrangements is not recognized until the acceptance has been received or the acceptance period has lapsed. We reduce our product revenue by the estimated cost of any rebates, allowances or similar programs, which are used as promotional programs.

Recording revenue from the sale of products involves the use of estimates and management judgment. We must make a determination at the time of sale whether the customer has the ability to make payments in accordance with arrangements. While we do utilize past payment history, and, to the extent available for new customers, public credit information in making our assessment, the determination of whether collectibility is reasonably assured is ultimately a judgment decision that must be made by management. We must also make estimates regarding our future obligation relating to returns, rebates, allowances and similar other programs.

License revenue under arrangements to sell or license product rights or technology rights is recognized as obligations under the agreement are satisfied, which generally occurs over a period of time. Generally, licensing revenue is deferred and recognized over the estimated life of the related agreements, products, patents or technology. Nonrefundable licensing fees, marketing rights and milestone payments received under contractual arrangements are deferred and recognized over the remaining contractual term using the straight-line method. Revenue from licensing technology and product rights is reported in our Research, development and other revenue line item.

Recording revenue from license arrangements involves the use of estimates. The primary estimate made by management is determining the useful life of the related agreement, product, patent or

technology. We evaluate all of our licensing arrangements by estimating the useful life of either the product or the technology, the length of the agreement or the legal patent life and defer the revenue for recognition over the appropriate period.

Occasionally we enter into arrangements that include multiple elements. Such arrangements may include the licensing of technology and manufacturing of product. In these situations we must determine whether the various elements meet the criteria to be accounted for as separate elements. If the elements cannot be separated, revenue is recognized once revenue recognition criteria for the entire arrangement have been met or over the period that the Company’s obligations to the customer are fulfilled, as appropriate. If the elements are determined to be separable, the revenue is allocated to the separate elements based on relative fair value and recognized separately for each element when the applicable revenue recognition criteria have been met. In accounting for these multiple element arrangements, we must make determinations about whether elements can be accounted for separately and make estimates regarding their relative fair values.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts receivable based on client-specific allowances, as well as a general allowance. Specific allowances are maintained for clients which are determined to have a high degree of collectibility risk based on such factors, among others, as: (i) the aging of the accounts receivable balance; (ii) the client’s past payment experience; (iii) a deterioration in the client’s financial condition, evidenced by weak financial condition and/or continued poor operating results, reduced credit ratings, and/or a bankruptcy filing. In addition to the specific allowance, the Company maintains a general allowance for credit risk in its accounts receivable which is not covered by a specific allowance. The general allowance is established based on such factors, among others, as: (i) the total balance of the outstanding accounts receivable, including considerations of the aging categories of those accounts receivable; (ii) past history of uncollectible accounts receivable write-offs; and (iii) the overall creditworthiness of the client base. A considerable amount of judgment is required in assessing the realizability of accounts receivable. Should any of the factors considered in determining the adequacy of the overall allowance change, an adjustment to the provision for doubtful accounts receivable may be necessary.

Inventories

Inventories are stated at the lower of cost or market, cost being determined on the first-in, first-out method. Inventories are written down if the estimated net realizable value of an inventory item is less than its recorded value. We review the carrying cost of our inventories by product each quarter to determine the adequacy of our reserves for obsolescence. In accounting for inventories we must make estimates regarding the estimated net realizable value of our inventory. This estimate is based, in part, on our forecasts of future sales and shelf life of product.

Capitalized Patent Costs

We defer and capitalize certain costs, including payments to third-party law firms for patent prosecution to expand the scope of our patents, related to the technology or patents underlying a variety of long-term licensing agreements. We own a portfolio of patents not currently utilized in our product development or manufacture. Several entities have paid upfront licensing fees to utilize the technology supported by these patents in their own product development and commercialization efforts. Because we believe that we have an obligation to protect the underlying patents, we defer the revenue associated with these long-term agreements and the direct and incremental costs of prosecuting the patents that support the agreements. We use the term “patent prosecution” in this context in the narrow sense often used by intellectual property professionals – to describe activities where we seek to expand the scope of existing patents such as geographically, where we may look to expand patent protection into new countries, or for broader applications, such as for newly contemplated uses or expanded claim breadth coverage of the technology defined by those licensing its technology within existing geographies. A situation where a third party has violated our intellectual property rights by using our patented technology without permission and we have filed a corresponding lawsuit would not meet this definition of “patent prosecution” and we would therefore expense the corresponding legal expenses as incurred. In accordance with SFAS No. 95, paragraph 17(c), we have classified patent prosecution expenditures which are capitalized as cash used for investing activities since, like a capital expenditure to improve a building or add a piece of equipment, the cost is a necessary investment into a productive asset to maintain our future revenue process. No internal costs are capitalized. These capitalized costs are amortized over the same period as the licensing revenue related to those patents is recognized. Costs in excess of the amount of remaining related deferred licensing revenue are not capitalized, but are expensed as incurred. The Company capitalized approximately $65 thousand and $60 thousand for the three months ended March 31, 2006 and 2005, respectively and amortized approximately $216 thousand and $40 thousand for the same periods, respectively.

Results of Operations

Revenue

Total revenue consists of two components: 1) product revenue and 2) research, development and other revenue. Total revenue increased 2% to $17.5 million for the three months ended March 31, 2006 as compared to $17.2 million for the corresponding period in 2005. Product revenue increased 1% to $17.0 million for the three months ended March 31, 2006 as compared to $16.8 million for the corresponding period in 2005.

Product revenue from our Core Companion Animal Health segment was $14.3 million for the three months ended March 31, 2006, an increase of 11% as compared to $12.9 million for the corresponding period in 2005. Key factors in the increase were higher sales of our heartworm diagnostic test, our heartworm preventive, our instrument consumables and our IV pumps, somewhat offset by lower sales of our hematology instrument and our chemistry instrument.

Product revenue from our Other Vaccines, Pharmaceuticals and Products segment (“OVP”) decreased by 32% to $2.7 million for the three months ended March 31, 2006 as compared to $4.0 million for the corresponding period in 2005. A key factor in the decline was purchases of our bovine vaccines under our contract with AgriLabs by Intervet which occurred in the first quarter of 2005, but not 2006. Intervet launched a line of bovine vaccines competitive with ours in 2005.

Revenue from research, development and other increased 67% to $532 thousand for the three months ended March 31, 2006 from $318 thousand for the corresponding period in 2005. The increase was primarily due to the acceleration of deferred licensing fees which were recognized due to a third party terminating its licensing agreement.

For 2006, we expect to grow our Core Companion Animal Health segment product revenue as compared to 2005. We anticipate OVP product revenue to decrease slightly as compared to 2005. We expect research, development and other revenue to decline slightly in 2006 as compared to 2005.

Cost of Revenue

Cost of revenue consists of two components: 1) cost of products sold and 2) cost of research, development and other revenue, both of which correspond to their respective revenue categories. Cost of revenue totaled $10.6 million for the first three months of 2006, a 5% decrease as compared to $11.2 million for the corresponding period in 2005. Gross profit increased 16% to $6.9 million for the three months ended March 31, 2006 as compared to $5.9 million in the prior year corresponding period. Gross Margin, i.e. gross profit divided by total revenue, increased to 39.2% for the three months ended March 31, 2006 as compared to 34.5% in the corresponding period in 2005.

Cost of products sold decreased 8% to $10.2 million in the three months ended March 31, 2006 from $11.1 million in the prior year period. Gross profit on product revenue increased 17% to $6.8 million for the three months ended March 31, 2006 from $5.8 million in the prior year period. Product Gross Margin, i.e. gross profit on product revenue divided by product revenue, increased to 39.8% in the three months ended March 31, 2006 as compared to 34.3% in the corresponding period in 2005. Key factors in the improvement were higher sales of our heartworm diagnostic tests, where an agreement under which we paid certain royalties expired in 2005, higher sales and margins in our heartworm preventive product, where we now have taken in house certain manufacturing operations we previously outsourced, a greater proportion of revenue from instrument consumable sales, which typically carry a higher than average gross margin and a lower proportion of revenue from our OVP segment, which tends to carry a lower than average gross margin.

Cost of research, development and other revenue increased 143% to $435 thousand in the three months ended March 31, 2006 as compared to $179 thousand in the prior year period. Gross profit on research, development and other revenue decreased 30% to $97 thousand for the three months ended March 31, 2006 from $139 thousand in the prior year period. Other Gross Margin, i.e. gross profit on research, development and other revenue divided by research, develoment and other revenue, declined to 18.2% for the three months ended March 31, 2006 as compared to 43.7% in the prior year period. A key factor in the decrease was the acceleration of capitalized patent costs in accordance with the acceleration of deferred licensing fees which were recognized due to a third party terminating its licensing agreement during the three months ended March 31, 2006.

We expect Gross Margin to increase in 2006 as compared to 2005 as we expect to sell a greater proportion of total product sales in relatively higher margin products.

Operating Expenses

Total operating expenses decreased 3% to $6.8 million in the three months ended March 31, 2006 as compared to $7.0 million in the prior year period.

Selling and marketing expenses consist primarily of salaries, commissions and benefits for sales and marketing personnel and expenses related to product advertising and promotion. Selling and marketing expenses decreased 3% to $3.7 million in the three months ended March 31, 2006 as compared to $3.8 million in the corresponding period in 2005. Key factors in the decline were lower compensation and benefits costs, lower travel expenses, both of which were related to reductions in headcount, and lower spending related to our hematology instrument.

Research and development expenses declined 39% to $745 thousand for the three months ended March 31, 2006 from $1.2 million during the corresponding period in 2005. The decline was primarily due to lower compensation and benefits costs primarily due to reductions in headcount.

General and administrative expenses were $2.4 million in the three months ended March 31, 2006, up 20% from $2.0 million in the prior year period. Key factors in the increase include increased rent expense and increased compensation expense, the latter related primarily to our 2006 Management Incentive Plan (“MIP”).

In 2006, we expect total operating expenses to increase as compared to 2005. We expect operating expenses generally will increase more slowly than increases in revenue.

Interest and Other Expense, Net

Net Interest expense was $302 thousand in the three months ended March 31, 2006, an increase of $78 thousand from $223 thousand in the prior year period. The increase in both cases reflects the greater usage of borrowings under our credit and security agreement with Wells Fargo Bank, National Association (“Wells Fargo”), increases in Wells Fargo’s prime rate and negotiated spread rate increases with Wells Fargo. In the three months ended March 31, 2006, net interest expense was somewhat offset by $42 thousand in gains from foreign currency translation, as compared to $18 thousand in gains from foreign currency translation in the three months ended March 31, 2005.

We expect net interest expense to increase in 2006 as compared to 2005 due to additional term loan borrowings agreed to in July 2005 with Wells Fargo and as we use our revolving credit facility more extensively to fund our growth.

Income Tax Expense

We recognized $21 thousand of income tax expense in the three months ended March 31, 2006. We paid no cash income taxes in this period, but did utilize our net operating loss carryforward in Switzerland, as discussed below.

We did not recognize any income tax expense in the three months ended March 31, 2005. This is because we had not been consistently profitable historically and, accordingly, did not recognize a tax benefit on our pre-tax losses. Based on the profitable operating performance of Heska AG, we concluded in the fourth quarter of 2005 that our NOL in Switzerland was realizable on a more-likely-than-not basis. Correspondingly, we reduced the related valuation allowance, which resulted in an income tax benefit of approximately $185 thousand in the fourth quarter of 2005. This results in a deferred tax asset equal to the approximate value of income taxes Heska will recognize in its future statements of operations as income tax that it will not actually pay in cash as Heska utilizes its NOLs, such as occurred during the three months ended March 31, 2006.

We expect to incur approximately $75 thousand in 2006 tax expense related to federal taxes in Switzerland. As discussed above, we do not expect to pay cash taxes in 2006.

Net Loss

Our net loss was $239 thousand in the three months ended March 31, 2006, a decrease of over $1.0 million when compared to $1.3 million during the prior year period. The improvement was due to an increase in Gross Margin of over 450 basis points, as well as a slight increase in revenue and decrease in operating expenses.

In 2006, we expect to increase our net income primarily due to increased revenue and increased gross margins, somewhat offset by increased operating expenses.

Liquidity and Capital Resources

We have incurred net cumulative negative cash flow from operations since our inception in 1988. For the three months ended March 31, 2006, we had a net loss of $239 thousand. During the three months ended March 31, 2006, our operations provided cash of approximately $1.0 million. At March 31, 2006, we had

$5.0 million of cash and cash equivalents, $6.0 million of working capital, $8.4 million of outstanding borrowings under our revolving line of credit, discussed below, and $3.8 million of other debt and capital leases.

At March 31, 2006, we had a $12.0 million asset-based revolving line of credit which had a maturity date of June 30, 2009 as part of our credit and security agreement with Wells Fargo. At March 31, 2006, $8.4 million was outstanding under this line of credit. Our ability to borrow under this facility varies based upon available cash, eligible accounts receivable and eligible inventory. On March 31, 2006, interest was charged at a stated rate of prime plus 3.0% and was payable monthly. We are required to comply with various financial and non-financial covenants, and we have made various representations and warranties. Among the financial covenants is a requirement to maintain a minimum liquidity (cash plus excess borrowing base) of $1.5 million. Additional requirements include covenants for minimum capital monthly and minimum net income quarterly. Failure to comply with any existing or future covenants, representations or warranties could result in our being in default on the loan and could cause all outstanding amounts payable to Wells Fargo as well as others, including those discussed below, to become immediately due and payable or impact our ability to borrow under the agreement. Any default under the Wells Fargo agreement could also accelerate the repayment of our other borrowings. We were in compliance with all financial covenants as of March 31, 2006. At March 31, 2006, our remaining available borrowing capacity based upon eligible accounts receivable and eligible inventory under our revolving line of credit was approximately $1.3 million.

At March 31, 2006, we also had outstanding obligations for long-term debt and capital leases totaling approximately $3.8 million primarily related to three term loans with Wells Fargo and a subordinated promissory note with a significant customer with the proceeds used for facilities enhancements. One term loan is secured by real estate and had an outstanding balance at March 31, 2006 of approximately $852 thousand due in monthly installments of $17,658 plus interest, with a balloon payment of approximately $163 thousand due on June 30, 2009. The term loan had a stated interest rate of prime plus 3.0% on March 31, 2006. In July 2005, we borrowed an additional $2.5 million from Wells Fargo which was secured by machinery and equipment at our Des Moines, Iowa and Loveland, Colorado locations (the “Equipment Notes”). The Equipment Notes had a stated interest rate of prime plus 3.0% as of March 31, 2006. The Equipment Notes had an outstanding balance at March 31, 2006 of approximately $2.4 million with principal payments on the Equipment Notes of $46,296 plus interest due in monthly installments with a balloon payment of approximately $602 thousand due upon maturity of the credit facility agreement on June 30, 2009. The subordinated promissory note is secured by our production facility, has a stated interest rate of prime plus 1.0% and a remaining balance of $500 thousand payable on May 31, 2006 and the lender has subordinated its first security interest to Wells Fargo. In addition, we have a promissory note to the City of Des Moines with an outstanding balance at March 31, 2006 of approximately $17 thousand, due in monthly installments through June 2006. This promissory note has a stated interest rate of 3.0%. The note is secured by first security interests in essentially all of our OVP segment’s assets and the lender has subordinated its first security interest to Wells Fargo. Our capital lease obligations totaled approximately $25 thousand at March 31, 2006.

Net cash provided by operating activities was $1.0 million for the three months ended March 31, 2006 as compared to $324 thousand during the corresponding period in 2005. Major factors in the improvement were a $1.1 million lower net loss and $502 thousand increase in cash provided by changes in accrued liabilities, somewhat offset by a $1.1 million greater use of cash to purchase inventories in the three months ended March 31, 2006 as compared to prior year period.

Net cash flows from investing activities used cash of $183 thousand in the three months ended March 31, 2006, compared to $726 thousand during the corresponding period in 2005, with the change due primarily to decreased capital expenditures in 2006 as compared to 2005.

Net cash flows from financing activities used cash of $1.1 million during the three months ended March 31, 2006 as compared to providing $210 thousand during the corresponding period in 2005. In 2006, the cash was used primarily by the repayments on the revolving line of credit. In 2005, the cash was provided primarily from net borrowings under our revolving line of credit.

At March 31, 2006, we had net intangible assets of approximately $1.4 million related to deferred patent costs. These deferred patent costs are being recognized as research and development costs on a straight-line basis over the remaining lives of the agreements, products, patents or technology. We also had total deferred revenue and other long-term liabilities, net of current portion, of approximately $9.8 million. Included in this total is approximately $9.5 million of deferred revenue related to up-front licensing fees that have been received for certain product rights and technology rights out-licensed during the three months ended March 31, 2006 and prior. These deferred amounts are being recognized on a straight-line basis over the remaining lives of the agreements, products, patents or technology.

Our primary short-term need for capital, which is subject to change, is to fund our operations, which consist of continued sales and marketing, general and administrative and research and development efforts, working capital associated with increased product sales and capital expenditures relating to maintaining and developing our manufacturing operations. Our future liquidity and capital requirements will depend on numerous factors, including the extent to which our marketing, selling and distribution efforts, as well as those of third parties who market, sell and distribute our products, are successful in increasing revenue, the extent to which currently planned products and/or technologies under research or development are successfully developed, the extent of the market acceptance of any new products, changes required of us by regulatory bodies to maintain our operations and other factors.

Our financial plan for 2006 indicates that our available cash and cash equivalents, together with cash from operations and borrowings expected to be available under our revolving line of credit, will be sufficient to fund our operations through 2006 and into 2007. Our financial plan for 2006 expects that we will have positive cash flow from operations, primarily through increased revenue, improved gross margins and limiting any increase in operating expenses to a modest degree. However, our actual results may differ from this plan, and we may be required to consider alternative strategies. We may be required to raise additional capital in the future. If necessary, we expect to raise these additional funds through one or more of the following: (1) sale of equity or debt securities; (2) obtaining new loans secured by unencumbered assets, or refinancing loans currently outstanding on properties with historical appraised values significantly in excess of related debt; (3) sale of assets, products or marketing rights; and (4) licensing of technology. There is no guarantee that additional capital will be available from these sources on acceptable terms, if at all, and certain of these sources may require approval by existing lenders. If we cannot raise the additional funds through these options on acceptable terms or with the necessary timing, management could also reduce discretionary spending to decrease our cash burn rate through actions such as delaying or canceling research projects or marketing plans. These actions would likely extend the then available cash and cash equivalents, and then available borrowings. See “Risk Factors.”

Net Operating Loss Carryforwards

As of December 31, 2005, we had a net domestic operating loss carryforward, or NOL, of approximately $171.7 million, a domestic alternative minimum tax credit of approximately $23 thousand and a domestic research and development tax credit carryforward of approximately $307 thousand. The NOL and tax credit carryforwards are subject to alternative minimum tax limitations and to examination by the tax authorities. In addition, we had a “change of ownership” as defined under the provisions of Section 382 of the Internal Revenue Code of 1986, as amended (an “Ownership Change”). We believe the latest, and most restrictive, Ownership Change occurred at the time of our initial public offering in July 1997. We do not believe this Ownership Change will place a significant restriction on our ability to utilize our NOLs in the future. We also had net operating loss carryforwards in Switzerland of approximately $1.9 million related to losses previously recorded by Heska AG. Heska AG also has a “tax holiday” from canton, municipal and church income taxes in the canton of Fribourg through August 31, 2007.

Recent Accounting Pronouncements

None.

Adoption of SFAS No. 123R, “Share-Based Payment” (Revised 2004)

Statement of Financial Accounting Standards No. 123 “Share-Based Payments” (“SFAS No. 123R”) was revised and promulgated in December 2004. We adopted this standard on January 1, 2006 under the modified prospective method of adoption. Statement of Financial Accounting Standards No. 123, “Accounting for Stock-Based Compensation” (“SFAS No. 123”), which became effective in 1996, allows for the continued measurement of compensation cost for stock-based compensation using the intrinsic value based method under Accounting Principles Board Opinion No. 25 “Accounting for Stock Issued to Employees” (“APB No. 25”), provided that pro forma disclosures are made of net income or loss assuming the fair value based method of SFAS No. 123 had been applied. Prior to January 1, 2006, we have elected to account for our stock-based compensation plans under APB No. 25. Under SFAS No. 123R, we are required to recognize compensation expense using the fair value-based model for options that vest on or after January 1, 2006, including those that were granted prior to January 1, 2006. Historically, under APB No. 25, we have recorded minimal amounts of stock-based compensation. On February 24, 2005, our Board of Directors considered the significant impact that the use of fair values, rather than intrinsic values, would have on our future results of operations, as well as factors including that the management team had requested that their salaries be frozen for 2005, many non-management employees’ 2005 raises were to be at below market levels, no management bonus payouts were made for 2004 and the 2005 management incentive plan called for a performance in excess of our internal budget before any bonus payments were to be made, and authorized our Stock Option Committee, which consisted solely of our Chief Executive Officer, to immediately vest all options granted from that date through June 30, 2005 and to accelerate the vesting of any outstanding but unvested stock options with a strike price that was not “in-the-money” at its discretion (the aggregate authorization to the Stock Option Committee to be known as the “Vesting Authorization”) through June 30, 2005. On March 30, 2005 our Stock Option Committee exercised its discretion and accelerated the vesting of outstanding but unvested stock options with a strike price greater than or equal to $0.82. These options were not “in-the-money” at that time, and therefore, there was no compensation expense recorded in accordance with APB No. 25 as a result of this modification. However, for pro forma purposes, in accordance with SFAS No. 123, the remaining unamortized compensation related to these options are reported in the footnotes to our financial statements. This action effected approximately 750 thousand options, approximately 55 thousand of which were held by our Directors and Executive Officers. This follows a similar action for similar reasons in December 2004 under which approximately 2.2 million outstanding but unvested stock options were immediately vested. We also have an employee stock purchase plan under which we began to recognize compensation expense under SFAS No. 123R on January 1, 2006.

There are four key inputs to the Black-Scholes model which we use to value our options: expected term, expected volatility, risk-free interest rate and expected dividends, all of which require us to make estimates. Our estimates for these inputs may not be indicative of actual future performance and changes to any of these inputs can have a material impact on the resulting fair value calculated for the option. Our expected term input was estimated based on our historical experience for time from option grant to option exercise for all employees and we treated all employees in one grouping in both periods reported. Our expected volatility input was estimated based on our historical stock price volatility in both periods reported. Our risk-free interest rate input was determined based on the U.S. Treasury yield curve at the time of option issuance in both periods reported. Our expected dividends input was zero in both periods reported. Different assumptions could materially impact the resulting option value calculated. In the three months ended March 31, 2006, we had pro forma stock option compensation of approximately $48 thousand related to recognition of the vesting of options to purchase approximately 91 thousand shares. The underlying assumptions made in valuing these stock options, weighted by number of options and stock fair value at the time of grant, were as follows: expected term of 3.1 years, expected volatility of 92%, risk-free interest rate of 3.98% and expected dividends of zero. A tranche of “at-the-money” options granted under these assumptions in the same number as above would require a fair value price of approximately $0.87 per share (the “Benchmark Tranche”) to yield the same value as above (the “Benchmark Value”). The following table represents the approximate decrease, in thousands of dollars, of the value of the Benchmark Tranche under different expected term and expected volatility assumptions assuming all other inputs are the same. For example, the Benchmark Tranche is “at-the-money” options to purchase approximately 91 thousand shares with a fair market stock value of $0.87 per share, and if the Benchmark Tranche is valued

using an expected term of 3.1 years, expected volatility of 92%, a risk-free interest rate of 3.98% and expected dividends of zero, we obtain a fair value of approximately $48 thousand -- the Benchmark Value. If we value the Benchmark Tranche under the same assumptions, except we assume an expected term of 5.0 years instead of 3.1 years and an expected volatility of 60% instead of 92%, we obtain a value of approximately $43 thousand, or a decrease of approximately $5 thousand as compared to the Benchmark Value.

									Volatility
		15%		30%		45%			60%			75%			90%			105%			120%			135%			150%


	1		42		37		33			28			24			19			15			11			8			4
	2		38		32		26			20			14			9			4			(1	)		(5	)		(9)
Time to	3		35		28		21			14			7			1			(4	)		(9	)		(13	)		(17)
Expiration	4		32		24		16			9			2			(4	)		(10	)		(14	)		(18	)		(21)
(in years)	5		30		21		13			5			(2	)		(9	)		(14	)		(18	)		(22	)		(24)
	6		27		18		9			1			(6	)		(12	)		(17	)		(21	)		(24	)		(26)
	7		25		16		6			(2	)		(9	)		(15	)		(20	)		(23	)		(26	)		(28)
	8		23		13		4			(5	)		(12	)		(17	)		(22	)		(25	)		(27	)		(29)
	9		21		11		1			(7	)		(14	)		(19	)		(24	)		(26	)		(28	)		(29)
	10		19		9		(1	)		(9	)		(16	)		(21	)		(25	)		(27	)		(29	)		(30)

Stock option compensation related to recognition of the vesting of options of approximately $48 thousand for the three months ended on March 31, 2006 may not be indicative of the future impact of SFAS No. 123R. Assuming all options vest according to the vesting schedules currently in place, we have approximately $51 thousand of compensation cost to be recognized after March 31, 2006 underlying stock options currently outstanding, approximately $47 thousand of which is to be recognized in the nine months ending December 31, 2006. In addition, we expect to recognize approximately $155 thousand in stock option compensation related to options we expect to issue to members of our Board of Directors under our Director Compensation Policy during the nine months ending December 31, 2006. The Compensation Committee of our Board of Directors is currently considering alternatives regarding different forms of long-term compensation for future use, including the continued use of stock options. The decisions of the Compensation Committee of our Board of Directors regarding stock options is likely to be a key factor in the future impact of SFAS No. 123R on our financial statements.

Item 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk represents the risk of loss that may impact the financial position, results of operations or cash flows due to adverse changes in financial and commodity market prices and rates. We are exposed to market risk in the areas of changes in United States and foreign interest rates and changes in foreign currency exchange rates as measured against the United States dollar. These exposures are directly related to our normal operating and funding activities.

Interest Rate Risk

The interest payable on certain of our lines of credit and other borrowings is variable based on the United States prime rate and, therefore, is affected by changes in market interest rates. At March 31, 2006, approximately $12.1 million was outstanding on these lines of credit and other borrowings with a weighted average interest rate of 10.4%. We also had approximately $5.0 million of cash and cash equivalents at March 31, 2006, the majority of which was invested in liquid interest bearing accounts. We had no interest rate hedge transactions in place on March 31, 2006. We completed an interest rate risk sensitivity analysis based on the above and an assumed one-percentage point increase/decrease in interest rates. If market rates increase/decrease by one percentage point, we would experience an increase/decrease in annual net interest expense of approximately $71 thousand based on our outstanding balances as of March 31, 2006.

Foreign Currency Risk

Our investment in foreign assets consists primarily of our investment in our European subsidiary. Foreign currency risk may impact our results of operations. In cases where we purchase inventory in one currency and sell corresponding products in another, our gross margin percentage is typically at risk based on foreign currency exchange rates. In addition, in cases where we may be generating operating income in foreign currencies, the magnitude of such operating income when translated into U.S. dollars will be at risk based on foreign currency exchange rates. Our agreements with suppliers and customers vary significantly in regard to the existence and extent of currency adjustment and other currency risk sharing provisions. We had no foreign currency hedge transactions in place on March 31, 2006.

We have a wholly-owned subsidiary in Switzerland which uses the Swiss Franc as its functional currency. We purchase inventory in foreign currencies, primarily Japanese Yen and Euros, and sell corresponding products in U.S. dollars. We also sell products in foreign currencies, primarily Japanese Yen and Euros, where our inventory costs are in U.S. dollars. Based on our results of operations for the most recent 12 months, if foreign currency exchange rates were to strengthen/weaken by 25% against the dollar, we would expect a resulting pre-tax loss/gain of approximately $802 thousand.

Item 4.

CONTROLS AND PROCEDURES

(a) Evaluation of Disclosure Controls and Procedures. Our management, with the participation of our chief executive officer and our chief financial officer, evaluated the effectiveness of our disclosure controls and procedures, as defined by Rule 13a-15 of the Exchange Act, as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, our chief executive officer and our chief financial officer have concluded that our disclosure controls and procedures are adequate to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our chief executive officer and chief financial officer, as appropriate, to allow timely decisions regarding required disclosure.

(b) Changes in Internal Control over Financial Reporting. There was no change in our internal control over financial reporting that occurred during our last fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

If, as of June 30, 2006, we meet the definition of “accelerated filer,” as defined by Rule 12b-2 of the Exchange Act, we will be required by the Sarbanes-Oxley Act of 2002 to include an assessment of our internal control over financial reporting and attestation from our independent registered public accounting firm in our Annual Report on Form 10-K for our fiscal year ending December 31, 2006. If, however we are not deemed an “accelerated filer” at that time, under current SEC rules we will not have to include such assessment and attestation until our Annual Report on Form 10-K for our fiscal year ending December 31, 2007.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we may be involved in litigation relating to claims arising out of our operations. On September 9, 2005, United Vaccines, Inc. (“United”), a customer of our OVP segment, filed a lawsuit in Madison, Wisconsin against our Diamond Animal Health, Inc. subsidiary (“Diamond”) and Heska Corporation alleging various claims, including breach of contract and breach of warranty, and demanding compensatory and punitive damages. On October 20, 2005, we filed a motion to dismiss certain claims against Diamond and all claims against Heska, as well as an answer to United’s claims, affirmative defenses and counterclaims on behalf of Diamond. Both sides subsequently filed amended complaints and the matter is ongoing. While we intend to pursue the matter vigorously and believe we are entitled to damages from United and that United is not entitled to damages from Heska or Diamond, there can be no assurance the ultimate resolution of this case will reflect our current beliefs.

Item 1A. Risk Factors

Our future operating results may vary substantially from period to period due to a number of factors, many of which are beyond our control. The following discussion highlights these factors and the possible impact of these factors on future results of operations. If any of the following factors actually occur, our business, financial condition or results of operations could be harmed. In that case, the price of our common stock could decline and you could experience losses on your investment.

The loss of significant customers could harm our operating results.

Sales to no single customer accounted for more than 10% of our consolidated revenue or accounts receivable for either of the three month periods ended March 31, 2005 and 2006. While we do not have any other customers who represented more than 10% of revenues over the last two years, the loss of significant customers who, for example, are historically large purchasers or who are considered leaders in their field could damage our business and financial results. For example, on April 6, 2006, Henry Schein, Inc. (“Henry Schein”) announced it had completed the acquisition of NLS Animal Health (“NLS”). Henry Schein is our largest independent third party distributor and NLS is a distributor of IDEXX products. We believe IDEXX effectively prohibits its distributors from selling competitive products, including our diagnostic instruments and heartworm diagnostic tests. If Henry Schein were to decide not to carry our full product line due to prohibitions IDEXX effectively places on its distributors or for other reasons, our sales would likely suffer as it is unlikely we would completely recover the corresponding lower sales to Henry Schein through direct sales and sales through other distributors.

We may be unable to successfully market, sell and distribute our products.

We may not successfully develop and maintain marketing, distribution or sales capabilities, and we may not be able to make arrangements with third parties to perform these activities on satisfactory terms. If our marketing, sales and distribution strategy is unsuccessful, our ability to sell our products will be negatively impacted and our revenues will decrease.

The market for companion animal healthcare products is highly fragmented. Because our Core Companion Animal Health proprietary products are generally available only to veterinarians or by prescription and our medical instruments require technical training to operate, we ultimately sell our Core Companion Animal Health products only to or through veterinarians. The acceptance of our products by veterinarians is critical to our success. Changes in our ability to obtain or maintain such acceptance or changes in veterinary medical practice could significantly decrease our anticipated sales.

We currently market our Core Companion Animal Health products in the United States to veterinarians through approximately 10 independent third-party distributors who carry our full line of Core Companion Animal Health products, approximately 14 independent third-party distributors who carry portions of our Core Companion Animal Health product line and through a direct sales force of approximately 28 individuals. To be successful, we will have to effectively market our products and continue to develop and train our direct sales force as well as sales personnel of our distributors and rely on other arrangements with third parties to market, distribute and sell our products. In addition, most of our distributor agreements can be terminated on 60 days notice and we believe that IDEXX, one of our largest competitors, effectively prohibits its distributors from selling competitive products, including our diagnostic instruments and heartworm diagnostic tests. We believe this restriction significantly limits our ability to engage national distributors to sell our full line of products and significantly restricts our ability to market our products to veterinarians. In 2002, one of our largest distributors informed us that they were going to carry IDEXX products and that they no longer would carry our diagnostic instruments and heartworm diagnostic tests. In late 2004, this distributor acquired another of our distributors. We believe IDEXX effectively prohibits this distributor from carrying our diagnostic instruments and heartworm diagnostic tests as a condition for having access to buy the IDEXX product line.

We rely substantially on third-party suppliers. The loss of products or delays in product availability from one or more third-party supplier could substantially harm our business.

To be successful, we must contract for the supply of, or manufacture ourselves, current and future products of appropriate quantity, quality and cost. Such products must be available on a timely basis and be in compliance with any regulatory requirements. Failure to do so could substantially harm our business.

We currently rely on third party suppliers to manufacture those products we do not manufacture ourselves. Products provided by these suppliers represent a majority of our revenues. We currently rely on these suppliers for our veterinary diagnostic and patient monitoring instruments and consumable supplies for these instruments, for certain of our point-of-care diagnostic and other tests, for the manufacture of our allergy immunotherapy treatment products as well as for the manufacture of other products. Major suppliers who sell us products they manufacture which are responsible for more than 5% or more of our revenue are i-STAT Corporation (a unit of Abbott Laboratories), Arkray Global Business, Inc., Boule Medical AB and Quidel. We often purchase products from our suppliers under agreements that are of limited duration or potentially can be terminated on an annual basis. Although we believe we have agreements in place to ensure supply of our major product offerings through at least the end of 2006 and we believe we are in compliance with such agreements, there can be no assurance that our suppliers will be able to meet their obligations under these agreements or that we will be able to compel them to do so. Risks of relying on suppliers include:

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The loss of product rights upon expiration or termination of an existing agreement. Unless we are able to find an alternate supply of a similar product, we would not be able to continue to offer our customers the same breadth of products and our sales and operating results would likely suffer. In the case of an instrument supplier, we could also potentially suffer the loss of sales of consumable supplies, which would be significant in cases where we have built a significant installed base, further harming our sales prospects and opportunities. Even if we were able to find an alternate supply, we would likely face increased competition from the product whose rights we lost being marketed by a third party or the former supplier and it may take us additional time and expense to gain the necessary approvals and launch an alternative product.

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High switching costs. In certain of our diagnostic instrument products we would lose the consumable revenues from the installed base of those instruments if we were to switch to a competitive instrument. If we need to change to other commercial manufacturing contractors for certain of our regulated products, additional regulatory licenses or approvals must be obtained for these contractors prior to our use. This would require new testing and compliance inspections prior to sale thus resulting in potential delays. Any new manufacturer would have to be educated in, or develop substantially equivalent processes necessary for the production of our products. We likely would

have to train our sales force, distribution network employees and customer support organization on the new product and spend significant funds marketing the new product to our customer base.

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The involuntary or voluntary discontinuation of a product line. Unless we are able to find an alternate supply of a similar product in this or similar circumstances with any product, we would not be able to continue to offer our customers the same breadth of products and our sales would likely suffer. Even if we are able to identify an alternate supply, it may take us additional time and expense to gain the necessary approvals and launch an alternative product, especially if the product is discontinued unexpectedly.

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Inability to meet minimum obligations. Current agreements, or agreements we may negotiate in the future, may commit us to certain minimum purchase or other spending obligations. It is possible we will not be able to create the market demand to meet such obligations, which could create a drain on our financial resources and liquidity. Some such agreements may require minimum purchases and/or sales to maintain product rights and we may be significantly harmed if we are unable to meet such requirements and lose product rights.

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Loss of exclusivity. Current agreements, or agreements we may negotiate in the future, with suppliers may require us to meet minimum annual sales levels to maintain our position as the exclusive distributor of these products. We may not meet these minimum sales levels in the future and maintain exclusivity over the distribution and sale of these products. If we are not the exclusive distributor of these products, competition may increase.

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Limited capacity or ability to scale capacity. If market demand for our products increases suddenly, our current suppliers might not be able to fulfill our commercial needs, which would require us to seek new manufacturing arrangements and may result in substantial delays in meeting market demand. If we consistently generate more demand for a product than a given supplier is capable of handling, it could lead to large backorders and potentially lost sales to competitive products that are readily available. This could require us to seek or fund new sources of supply, which may be difficult to find unless it is under terms that are less advantageous.

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Inconsistent or inadequate quality control. We may not be able to control or adequately monitor the quality of products we receive from our suppliers. Poor quality items could damage our reputation with our customers.

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Regulatory risk. Our manufacturing facility and those of some of our third party suppliers are subject to ongoing periodic unannounced inspection by regulatory authorities, including the FDA, USDA and other federal and state agencies for compliance with strictly enforced Good Manufacturing Practices, regulations and similar foreign standards, and we do not have control over our suppliers’ compliance with these regulations and standards. Violations could potentially lead to interruptions in supply that could cause us to lose sales to readily available competitive products.

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Developmental delays. We may experience delays in the scale-up quantities needed for product development that could delay regulatory submissions and commercialization of our products in development, causing us to miss key opportunities.

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Limited intellectual property rights. We may not have intellectual property rights, or may have to share intellectual property rights, to the products themselves and any improvements to the manufacturing processes or new manufacturing processes for our products.

Potential problems with suppliers such as those discussed above could substantially decrease sales, lead to higher costs, damage our reputation with our customers due to factors such as poor quality goods or delays in

order fulfillment, resulting in our being unable to effectively sell our products and substantially harm our business.

If the third parties to whom we granted substantial marketing rights for certain of our existing products or future products under development are not successful in marketing those products, then our sales and financial position may suffer.

Our agreements with our corporate marketing partners generally contain no or small minimum purchase requirements in order for them to maintain their exclusive or co-exclusive marketing rights. We are party to an agreement with SPAH which grants distribution and marketing rights in the U.S. for our canine heartworm preventive product, TRI-HEART Chewable Tablets. AgriLabs has the exclusive right to sell certain of our bovine vaccines in the United States, Africa, China, Mexico and Taiwan. Novartis Agro K.K. markets and distributes our SOLO STEP CH heartworm test in Japan. One or more of these marketing partners may not devote sufficient resources to marketing our products. Furthermore, there may be nothing to prevent these partners from pursuing alternative technologies or products that may compete with our products in current or future agreements. In the future, third-party marketing assistance may not be available on reasonable terms, if at all. If any of these events occur, we may not be able to commercialize our products and our sales will decline. In addition, both our agreements with SPAH and AgriLabs require us to potentially pay penalties if we are unable to supply product over an extended period of time.

We have historically not consistently generated positive cash flow from operations and may need additional capital and any required capital may not be available on acceptable terms or at all.

If our actual performance deviates from our operating plan, which anticipates we will be profitable in fiscal 2006 as a whole, we may be required to raise additional capital in the future. If necessary, we expect to raise these additional funds through one or more of the following: (1) sale of equity or debt securities; (2) obtaining new loans secured by unencumbered assets, or refinancing loans currently outstanding on properties with historical appraised values significantly in excess of related debt; (3) sale of assets, products or marketing rights; and (4) licensing of technology. There is no guarantee that additional capital will be available from these sources on acceptable terms, if at all, and certain of these sources may require approval by existing lenders. The public markets may be unreceptive to equity financings and we may not be able to obtain additional private equity or debt financing. Any equity financing would likely be dilutive to stockholders and additional debt financing, if available, may include restrictive covenants and increased interest rates that would limit our currently planned operations and strategies. We may not find any third parties interested in licensing our intellectual property or purchasing any of our assets, products or marketing rights in a timely manner, or at all. If we relinquish rights to certain of our intellectual property, or sell certain of our assets, products or marketing rights it may limit our future prospects. Additionally, amounts we expect to be available under our existing revolving line of credit may not be available and other lenders could refuse to provide us with additional debt financing. Furthermore, even if additional capital is available, it may not be of the magnitude required to meet our needs under these or other scenarios. If additional funds are required and are not available, it would likely have a material adverse effect on our business, financial condition and our ability to continue as a going concern.

We operate in a highly competitive industry, which could render our products obsolete or substantially limit the volume of products that we sell. This would limit our ability to compete and achieve profitability.

The market in which we compete is intensely competitive. Our competitors include independent animal health companies and major pharmaceutical companies that have animal health divisions. We also compete with independent, third party distributors, including distributors who sell products under their own private labels. In the point-of-care diagnostic testing market, our major competitors include IDEXX, Abaxis, Inc., AGEN Biomedical Limited and Synbiotics Corporation. The products manufactured by our OVP segment for sale by third parties compete with similar products offered by a number of other companies, some of which have substantially greater financial, technical, research and other resources than us and may have more established marketing, sales, distribution and service organization’s than our OVP segment’s customers. Competitors may

have facilities with similar capabilities to our OVP segment, which they may operate at a lower unit price to their customers, which could cause us to lose customers. Companies with a significant presence in the companion animal health market, such as Bayer AG, Intervet International bv (a unit of Akzo Nobel N.V.), Merial Limited, Novartis AG, Pfizer Inc., Schering-Plough Corporation, Virbac S.A. and Wyeth, may be marketing or developing products that compete with our products or would compete with them if developed. These and other competitors may have substantially greater financial, technical, research and other resources and larger, more established marketing, sales, distribution and service organizations than we do. Our competitors may offer broader product lines and have greater name recognition than we do. Our competitors may develop or market technologies or products that are more effective or commercially attractive than our current or future products or that would render our technologies and products obsolete. Further, additional competition could come from new entrants to the animal health care market. Moreover, we may not have the financial resources, technical expertise or marketing, distribution or support capabilities to compete successfully. We believe that one of our largest competitors, IDEXX, effectively prohibits its distributors from selling competitive products, including our diagnostic instruments and heartworm diagnostic tests. If we fail to compete successfully, our ability to achieve sustained profitability will be limited and sustained profitability, or profitability at all, may not be possible.

Many of our expenses are fixed and if factors beyond our control cause our revenue to fluctuate, this fluctuation could cause greater than expected losses, cash flow and liquidity shortfalls.

We believe that our future operating results will fluctuate on a quarterly basis due to a variety of factors which are generally beyond our control, including:

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supply of products from third party suppliers or termination of such relationships;

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the introduction of new products by our competitors or by us;

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competition and pricing pressures from competitive products;

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our ability to maintain relationships with distributors;

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large customers failing to purchase at historical levels, including changes in distributor purchasing patterns and inventory levels;

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fundamental shifts in market demand;

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manufacturing delays;

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shipment problems;

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regulatory and other delays in product development;

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product recalls or other issues which may raise our costs;

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changes in our reputation and/or market acceptance of our current or new products; and

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changes in the mix of products sold.

We have high operating expenses for personnel, marketing and new product development. Many of these expenses are fixed in the short term. If any of the factors listed above cause our revenues to decline, our operating results could be substantially harmed.

Interpretation of existing legislation, regulations and rules or implementation of future legislation, regulations and rules could cause our costs to increase or could harm us in other ways.

The Sarbanes-Oxley Act of 2002 (“Sarbanes-Oxley”) has increased our required administrative actions as a public company. The increase in general and administrative costs of complying with Sarbanes-Oxley will depend on how it is interpreted over time. Of particular concern are the level and timing of standards for internal control evaluation and reporting adopted under Section 404 of Sarbanes-Oxley. If our regulators and/or auditors adopt or interpret more stringent standards than we are anticipating, we and/or our auditors may be unable to conclude that our internal controls over financial reporting are designed and operating effectively, which could adversely affect investor confidence in our financial statements. Even if we and our auditors are able to conclude that our internal controls over financial reporting are designed and operating effectively in such a circumstance, our general and administrative costs are likely to increase. We may be required to obtain an audit of our internal

controls for the year ending December 31, 2006 if we are an accelerated filer as defined by Rule 12b-2 of the Securities Exchange Act of 1934, as amended, on June 30, 2006, and, if so, our general and administrative costs are likely to increase in 2006. Actions by other entities, such as enhanced rules to maintain our listing on the Nasdaq Capital Market, could also increase our general and administrative costs, as could further legislative action.

We may not be able to achieve sustained profitability.

Prior to 2005, we have incurred net losses on an annual basis since our inception in 1988 and, as of March 31, 2006, we had an accumulated deficit of $210.1 million. Notwithstanding our positive net income in 2005 and our expectation of profitability for 2006 as a whole, we have not consistently achieved profitability on an annual basis. Our ability to be profitable in future periods will depend, in part, on our ability to increase sales in our Core Companion Animal Health segment, including maintaining and growing our installed base of instruments and related consumables, to maintain or increase gross margins and to at least limit the increase in our operating expenses to a reasonable level. Even if we achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. If we cannot achieve or sustain profitability for an extended period, we may not be able to fund our expected cash needs, including the repayment of debt as it comes due, or continue our operations.

We often depend on third parties for products we intend to introduce in the future. If our current relationships and collaborations are not successful, we may not be able to introduce the products we intend to in the future.

We are often dependent on third parties and collaborative partners to successfully and timely perform research and development activities to successfully develop new products. For example, we jointly developed point-of-care diagnostic products with Quidel, and Quidel manufactures these products. In other cases, we have discussed Heska marketing in the veterinary market an instrument being developed by a third party for use in the human health care market. In the future, one or more of these third parties or collaborative partners may not complete research and development activities in a timely fashion, or at all. Even if these third parties are successful in their research and development activities, we may not be able to come to an economic agreement with them. If these third parties or collaborative partners fail to complete research and development activities, fail to complete them in a timely fashion, or if we are unable to negotiate economic agreements with such third parties or collaborative partners, our ability to introduce new products will be impacted negatively and our revenues may decline.

We may face costly intellectual property or other legal disputes, or our technology or that of our suppliers or collaborators may become the subject of legal action.

Our ability to compete effectively will depend in part on our ability to develop and maintain proprietary aspects of our technology and either to operate without infringing the proprietary rights of others or to obtain rights to technology owned by third parties. We have United States and foreign-issued patents and are currently prosecuting patent applications in the United States and various foreign countries. Our pending patent applications may not result in the issuance of any patents or any issued patents that will offer protection against competitors with similar technology. Patents we receive may be challenged, invalidated or circumvented in the future or the rights created by those patents may not provide a competitive advantage. We also rely on trade secrets, technical know-how and continuing invention to develop and maintain our competitive position. Others may independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets.

We may become subject to additional patent infringement claims and litigation in the United States or other countries or interference proceedings conducted in the United States Patent and Trademark Office, or USPTO, to determine the priority of inventions. The defense and prosecution of intellectual property suits, USPTO interference proceedings, and related legal and administrative proceedings are costly, time-consuming

and distracting. We may also need to pursue litigation to enforce any patents issued to us or our collaborative partners, to protect trade secrets or know-how owned by us or our collaborative partners, or to determine the enforceability, scope and validity of the proprietary rights of others. Any litigation or interference proceeding will result in substantial expense to us and significant diversion of the efforts of our technical and management personnel. Any adverse determination in litigation or interference proceedings could subject us to significant liabilities to third parties. Further, as a result of litigation or other proceedings, we may be required to seek licenses from third parties which may not be available on commercially reasonable terms, if at all.

We license technology from a number of third parties, including New England Biolabs, Inc. and Roche Molecular Systems, Inc., as well as a number of research institutions and universities. The majority of these license agreements impose due diligence or milestone obligations on us, and in some cases impose minimum royalty and/or sales obligations on us, in order for us to maintain our rights under these agreements. Our products may incorporate technologies that are the subject of patents issued to, and patent applications filed by, others. As is typical in our industry, from time to time we and our collaborators have received, and may in the future receive, notices from third parties claiming infringement and invitations to take licenses under third party patents. While we currently do not have any unresolved notices of infringement, there is no assurance that there will be none in the future. Any legal action against us or our collaborators may require us or our collaborators to obtain one or more licenses in order to market or manufacture affected products or services. However, we or our collaborators may not be able to obtain licenses for technology patented by others on commercially reasonable terms, or at all, we may not be able to develop alternative approaches if unable to obtain licenses, or current and future licenses may not be adequate for the operation of our businesses. Failure to obtain necessary licenses or to identify and implement alternative approaches could prevent us and our collaborators from commercializing our products under development and could substantially harm our business.

We may also face legal disputes relating to other areas of our business. These disputes may require significant expenditures on our part and could have material adverse consequences on our business in the case of an unfavorable ruling or settlement. For example, on September 9, 2005, United Vaccines, Inc. (“United”), a customer of our OVP segment, filed a lawsuit in Madison, Wisconsin against our Diamond Animal Health, Inc. subsidiary (“Diamond”) and Heska Corporation alleging various claims, including breach of contract and breach of warranty, and demanding compensatory and punitive damages. On October 20, 2005, we filed a motion to dismiss certain claims against Diamond and all claims against Heska, as well as an answer to United’s claims, affirmative defenses and counterclaims on behalf of Diamond. Both sides subsequently filed amended complaints and the matter is ongoing. While we intend to pursue the matter vigorously and believe we are entitled to damages from United and that United is not entitled to damages from Heska or Diamond, there can be no assurance the ultimate resolution of this case will reflect our current beliefs.

Our common stock is listed on the Nasdaq Capital Market and we may not be able to maintain that listing, which may make it more difficult for you to sell your shares.

Our common stock is listed on the Nasdaq Capital Market. The Nasdaq has several quantitative and qualitative requirements companies must comply with to maintain this listing, including a $1.00 minimum bid price. While we believe we are currently in compliance with all Nasdaq requirements, we have not always been able to maintain compliance in the past and there can be no assurance we will maintain compliance in the future. For example, in 2005 we received two communications from Nasdaq advising us we had failed to comply with the minimum $1.00 per share bid price requirement and the $35 million minimum value of listed securities requirement, respectively. While we subsequently received communications from Nasdaq advising us we have regained compliance in both matters and that both matters are now closed, there can be no assurance we will continue to meet these requirements or other requirements in the future. If we are delisted from the Nasdaq Capital Market, our common stock may be considered a penny stock under the regulations of the SEC and would therefore be subject to rules that impose additional sales practice requirements on broker-dealers who sell our securities. The additional burdens imposed upon broker-dealers may discourage broker-dealers from effecting transactions in our common stock, which could severely limit market liquidity of the common stock and your

ability to sell our securities in the secondary market. This lack of liquidity would also make it more difficult for us to raise capital in the future.

Our future revenues depend on successful research, development, commercialization and/or market acceptance, any of which can be slower than we expect or may not occur.

The research, development and regulatory approval process for many of our products is extensive and may take substantially longer than we anticipate. Research projects may fail. New products that we are developing for the veterinary marketplace may not perform up to our expectations. Because we have limited resources to devote to product development and commercialization, any delay in the research or development of one product or reallocation of resources to product development efforts that prove unsuccessful may delay or jeopardize the development of other product candidates. If we fail to successfully develop new products and bring them to market in a timely manner, our ability to generate additional revenue will decrease.

Even if we are successful in the research and development of a product, we may experience delays in commercialization and/or market acceptance. For example, there may be delays in producing large volumes of a product or veterinarians may be slow to adopt a product. The latter is particularly likely where there is no comparable product available or historical use of such a product. For example, while we believe our E.R.D.-HEALTHSCREEN urine tests for dogs and cats represent a significant scientific breakthrough in companion animal annual health examinations, market acceptance of the product has been significantly slower than we anticipated. The ultimate adoption of a new product by veterinarians, the rate of such adoption and the extent veterinarians choose to integrate such a product into their practice are all important factors in the economic success of one of our new products and are factors that we do not control to a large extent. If our products do not achieve a significant level of market acceptance, demand for our products will not develop as expected and our revenues will be lower than we anticipate.

Our stock price has historically experienced high volatility, which may increase in the future, and which could affect our ability to raise capital in the future or make it difficult for investors to sell their shares.

The securities markets have experienced significant price and volume fluctuations and the market prices of securities of many microcap and smallcap companies have in the past been, and can in the future be expected to be, especially volatile. During the past 12 months, our closing stock price has ranged from a low of $0.61 to a high of $1.71. Fluctuations in the trading price or liquidity of our common stock may adversely affect our ability to raise capital through future equity financings. Factors that may have a significant impact on the market price and marketability of our common stock include:

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stock sales by large stockholders or by insiders;

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our quarterly operating results, including as compared to our revenue, earnings or other guidance and in comparison to historical results;

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termination of our third party supplier relationships;

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announcements of technological innovations or new products by our competitors or by us;

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litigation;

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regulatory developments, including delays in product introductions;

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developments in our relationships with collaborative partners;

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developments or disputes concerning patents or proprietary rights;

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availability of our revolving line of credit and compliance with debt covenants;

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releases of reports by securities analysts;

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changes in regulatory policies;

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economic and other external factors; and

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general market conditions.

In the past, following periods of volatility in the market price of a company’s securities, securities class action litigation has often been instituted. If a securities class action suit is filed against us, it is likely we would incur substantial legal fees and our management’s attention and resources would be diverted from operating our business in order to respond to the litigation.

We depend on key personnel for our future success. If we lose our key personnel or are unable to attract and retain additional personnel, we may be unable to achieve our goals.

Our future success is substantially dependent on the efforts of our senior management and other key personnel, including Dr. Robert Grieve, our Chairman and Chief Executive Officer. The loss of the services of members of our senior management or other key personnel may significantly delay or prevent the achievement of our business objectives. Although we have an employment agreement with many of these individuals, all are at-will employees, which means that either the employee or Heska may terminate employment at any time without prior notice. If we lose the services of, or fail to recruit, key personnel, the growth of our business could be substantially impaired. We do not maintain key person life insurance for any of our key personnel.

If we are unable to maintain various financial and other covenants under our credit facility agreement we will be unable to borrow any funds under the agreement and fund our operations.

Under our credit and security agreement with Wells Fargo, as amended and restated in December 2005 and under prior agreements, we are required to comply with various financial and non-financial covenants in order to borrow under the agreement. The availability of borrowings under this agreement is essential to continue to fund our operations. Among the financial covenants is a requirement to maintain minimum liquidity (cash plus excess borrowing base) of $1.5 million. Additional requirements include covenants for minimum capital monthly and minimum net income quarterly. Although we believe we will be able to maintain compliance with all these covenants and any covenants we may negotiate in the future, there can be no assurance thereof. We have not always been able to maintain compliance with all covenants in the past, including in the first four months of 2005 and on June 30, 2005. Wells Fargo granted us a waiver of non-compliance in each case. However, there can be no assurance we will be able to obtain similar waivers or other modifications if needed in the future.

Failure to comply with any of the covenants, representations or warranties, or failure to modify them to allow future compliance, could result in our being in default under the loan and could cause all outstanding amounts and loans with our other lenders to become immediately due and payable, or impact our ability to borrow under the agreement. We intend to rely on available borrowings under the credit and security agreement to fund our operations in the future. If we are unable to borrow funds under this agreement, we will need to raise additional capital from other sources to continue our operations, which capital may not be available on acceptable terms, or at all.

Obtaining and maintaining regulatory approvals in order to market our regulated products may be costly and delay the marketing and sales of our products.

Many of the products we develop, market or manufacture are subject to extensive regulation by one or more of the USDA, the FDA, the EPA and foreign regulatory authorities. These regulations govern, among other things, the development, testing, manufacturing, labeling, storage, pre-market approval, advertising, promotion, sale and distribution of our products. Satisfaction of these requirements can take several years and time needed to satisfy them may vary substantially, based on the type, complexity and novelty of the product.

The effect of government regulation may be to delay or to prevent marketing of our products for a considerable period of time and to impose costly procedures upon our activities. We have experienced in the past, and may experience in the future, difficulties that could delay or prevent us from obtaining the regulatory approval or license necessary to introduce or market our products. Such delays in approval may cause us to forego a significant portion of a new product’s sales in its first year due to seasonality and advanced booking

periods associated with certain products. Regulatory approval of our products may also impose limitations on the indicated or intended uses for which our products may be marketed.

Among the conditions for certain regulatory approvals is the requirement that our facilities and/or the facilities of our third party manufacturers conform to current Good Manufacturing Practices. Our manufacturing facilities and those of our third party manufacturers must also conform to certain other manufacturing regulations, which include requirements relating to quality control and quality assurance as well as maintenance of records and documentation. The USDA, FDA and foreign regulatory authorities strictly enforce manufacturing regulatory requirements through periodic inspections. If any regulatory authority determines that our manufacturing facilities or those of our third party manufacturers do not conform to appropriate manufacturing requirements, we or the manufacturers of our products may be subject to sanctions, including warning letters, manufacturing suspensions, product recalls or seizures, injunctions, refusal to permit products to be imported into or exported out of the United States, refusals of regulatory authorities to grant approval or to allow us to enter into government supply contracts, withdrawals of previously approved marketing applications, civil fines and criminal prosecutions. In addition, certain of our agreements require us to pay penalties if we are unable to supply products, including for failure to maintain regulatory approvals. Any of these events, alone or in unison, could damage our business.

Changes to financial accounting standards may affect our results of operations and cause us to change our business practices.

We prepare our financial statements in conformance with United States generally accepted accounting principles, or GAAP. These accounting principles are established by and are subject to interpretation by the Financial Accounting Standards Board, the American Institute of Certified Public Accountants, the SEC and various bodies formed to interpret and create appropriate accounting policies. A change in those policies can have a significant effect on our reported results and may affect our reporting of transactions completed before a change is made effective. Changes to those rules may adversely affect our reported financial results or the way we conduct our business.

We may face product returns and product liability litigation in excess of or not covered by our insurance coverage. If we become subject to product liability claims resulting from defects in our products, we may fail to achieve market acceptance of our products and our sales could substantially decline.

The testing, manufacturing and marketing of our current products as well as those currently under development entail an inherent risk of product liability claims and associated adverse publicity. Following the introduction of a product, adverse side effects may be discovered. Adverse publicity regarding such effects could affect sales of our other products for an indeterminate time period. To date, we have not experienced any material product liability claims, but any claim arising in the future could substantially harm our business. Potential product liability claims may exceed the amount of our insurance coverage or may be excluded from coverage under the terms of the policy. We may not be able to continue to obtain adequate insurance at a reasonable cost, if at all. In the event that we are held liable for a claim against which we are not indemnified or for damages exceeding the $10 million limit of our insurance coverage or which results in significant adverse publicity against us, we may lose revenue, be required to make substantial payments which could exceed our financial capacity and/or lose or fail to achieve market acceptance. Furthermore, our agreements with some suppliers of our instruments contain limited warranty provisions, which may subject us to liability if a supplier fails to meet its warranty obligations if a defect is traced to our instrument or if we cannot correct errors reported during the warranty period. If our contractual limitations are unenforceable in a particular jurisdiction, a successful claim could require us to pay substantial damages.

We may be held liable for the release of hazardous materials, which could result in extensive clean up costs or otherwise harm our business.

Certain of our products and development programs produced at the Iowa facility involve the controlled use of hazardous and biohazardous materials, including chemicals, infectious disease agents and various radioactive compounds. Although we believe that our safety procedures for handling and disposing of such materials comply with the standards prescribed by applicable local, state and federal regulations, we cannot eliminate the risk of accidental contamination or injury from these materials. In the event of such an accident, we could be held liable for any fines, penalties, remediation costs or other damages that result. Our liability for the release of hazardous materials could exceed our resources, which could lead to a shutdown of our operations, significant remediation costs and potential legal liability. In addition, we may incur substantial costs to comply with environmental regulations if we choose to expand our manufacturing capacity.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults upon Senior Securities

None.

Item 4. Submission of Matters to a Vote of Security Holders

No matters were submitted to a vote of stockholders during the first quarter ended March 31, 2006.

Item 5. Other Information

In lieu of filing a Form 8-K under Item 5.02, we disclose the following. At our Annual Meeting of Stockholders (the “Annual Meeting”) on May 12, 2006, Mr. William A. Aylesworth was elected to a three year term on our Board of Directors set to expire in 2009. Dr. Tina S. Nova, who had been nominated to serve a three year term on our Board of Directors set to expire in 2009, requested that we withdraw her nomination prior to the Annual Meeting due to her other professional commitments. As a result of Dr. Nova’s decision, following our Annual Meeting on May 12, 2006, our Board of Directors voted to reduce the size of the Board of Directors to seven (7) members, with Class I consisting of three (3) Directors, Class II consisting of two (2) Directors and Class III consisting of two (2) Directors. Our Board of Directors then voted to appoint Mr. G. Irwin Gordon to our Corporate Governance Committee of the Board of Directors and to appoint Dr. Robert B. Grieve as a Class III Director (i.e., with a term scheduled to expire in 2009). Dr. Robert B. Grieve had previously been a Class II Director (i.e., with a term scheduled to expire in 2008).

Item 6. Exhibits

(a) Exhibits

Number		Notes		Description
10.1				Management Incentive Plan Master Document.
10.2				2006 Management Incentive Plan.
31.1				Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act, as amended.
31.2				Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act, as amended.
32.1				Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

HESKA CORPORATION

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

HESKA CORPORATION

Date: May 15, 2006

By    /s/  Robert B. Grieve
         ROBERT B. GRIEVE
         Chairman of the Board and Chief Executive Officer
         (on behalf of the Registrant and as the Registrant’s
         Principal Executive Officer)

Date: May 15, 2006

By    /s/  Jason A. Napolitano
      JASON A. NAPOLITANO
       Executive Vice President and Chief Financial Officer
        (on behalf of the Registrant and as the Registrant’s
       Principal Financial Officer)

UNITED STATESSECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 10-Q

Commission file number: 000-22427

TABLE OF CONTENTS

HESKA CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS(dollars in thousands except per share amounts)(unaudited)

HESKA CORPORATION AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts)(unaudited)

HESKA CORPORATION AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands)(unaudited)

HESKA CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS March 31, 2006(UNAUDITED)

1. ORGANIZATION AND BUSINESS

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3. CAPITAL STOCK

4. SEGMENT REPORTING

5. COMPREHENSIVE INCOME (LOSS)

Item 2.

MANAGEMENT’S DISCUSSION AND ANALYSISOF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

None.

Item 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Item 4.

CONTROLS AND PROCEDURES

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Item 1A. Risk Factors

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Item 3. Defaults upon Senior Securities

Item 4. Submission of Matters to a Vote of Security Holders

Item 5. Other Information

Item 6. Exhibits

HESKA CORPORATION

SIGNATURES

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(dollars in thousands except per share amounts)
(unaudited)

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)
(unaudited)

HESKA CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
(unaudited)

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
March 31, 2006
(UNAUDITED)

MANAGEMENT’S DISCUSSION AND ANALYSIS
OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS