FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Wisnewski Nancy 2. Date of Event Requiring Statement (Month/Day/Year) 05/02/2011 3. Issuer Name and Ticker or Trading Symbol HESKA CORP [HSKA] (Last) (First) (Middle) 3760 ROCKY MOUNTAIN AVENUE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP, Prod. Dev & Cust. Supp 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) LOVELAND, CO 80538 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 5,474 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Incentive Stock Option (right to buy) (1)	01/06/2003	01/06/2013	Common Stock	1,500	$ 3.4	D	Â
Incentive Stock Option (right to buy) (2)	11/04/2008	11/03/2018	Common Stock	5,000	$ 4.4	D	Â
Incentive Stock Option (right to buy) (3)	11/10/2009	11/10/2019	Common Stock	6,000	$ 4.5	D	Â
Incentive Stock Option (right to buy) (4)	12/31/2010	12/30/2020	Common Stock	6,000	$ 4.96	D	Â
Incentive Stock Option (right to buy) (5)	09/14/2009	09/13/2019	Common Stock	1,000	$ 5	D	Â
Incentive Stock Option (right to buy) (6)	03/30/2005	03/30/2015	Common Stock	6,500	$ 8.8	D	Â
Incentive Stock Option (right to buy) (7)	04/10/2003	04/10/2013	Common Stock	2,000	$ 9.5	D	Â
Incentive Stock Option (right to buy) (8)	02/05/2002	02/05/2012	Common Stock	3,500	$ 10.6	D	Â
Incentive Stock Option (right to buy) (9)	11/22/2004	11/22/2014	Common Stock	1,000	$ 11.6	D	Â
Incentive Stock Option (right to buy) (10)	01/12/2002	01/12/2012	Common Stock	1,000	$ 12.1	D	Â
Incentive Stock Option (right to buy) (14)	12/15/2005	12/15/2015	Common Stock	1,671	$ 12.5	D	Â
Incentive Stock Option (right to buy) (11)	09/02/2003	09/02/2013	Common Stock	1,000	$ 15.3	D	Â
Incentive Stock Option (right to buy) (12)	05/18/2004	05/18/2014	Common Stock	1,750	$ 15.9	D	Â
Incentive Stock Option (right to buy) (17)	11/17/2006	11/17/2016	Common Stock	5,824	$ 17.17	D	Â
Incentive Stock Option (right to buy) (13)	12/31/2007	12/31/2017	Common Stock	7,000	$ 18.3	D	Â
Non-Qualified Stock Option (right to buy) (15)	12/15/2005	12/15/2015	Common Stock	11,328	$ 12.5	D	Â
Non-Qualified Stock Option (right to buy) (16)	11/17/2006	11/17/2016	Common Stock	175	$ 17.17	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Wisnewski Nancy 3760 ROCKY MOUNTAIN AVENUE LOVELAND, CO 80538	Â	Â	  EVP, Prod. Dev & Cust. Supp	Â

Signatures

By: Jason Napolitano For: Nancy Wisnewski		05/04/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This option vested monthly in equal installments over one (1) year through January 6, 2004.
(2)	This option vests and becomes exercisable in monthly equal installments over four (4) years through November 4, 2012.
(3)	This option vests and becomes exercisable in monthly equal installments over four (4) years through November 10, 2013.
(4)	This option vests and becomes exercisable in monthly equal installments over four (4) years through December 31, 2014.
(5)	This option vests and becomes exercisable in monthly equal installments over four (4) years through September 14, 2013.
(6)	This option vested immediately.
(7)	This option vested monthly in equal installments over four (4) years through April 10, 2007. Vesting was accelerated to full vest on March 30, 2005.
(8)	This option vested monthly in equal installments over four (4) years through February 5, 2006. Vesting was accelerated to full vest on March 30, 2005.
(9)	This option vested monthly in equal installments over four (4) years through November 22, 2008. Vesting was accelerated to full vest on December 2, 2004.
(10)	This option vested monthly in equal installments over four (4) years through January 12, 2006. Vesting was accelerated to full vest on December 2, 2004.
(11)	This option vested monthly in equal installments over four (4) years through September 2, 2007. Vesting was accelerated to full vest on December 2, 2004.
(12)	This option vested monthly in equal installments over four (4) years through May 18, 2008. Vesting was accelerated to full vest on December 2, 2004.
(13)	This option vests and becomes exercisable in monthly equal installments over four (4) years through December 31, 2011.
(14)	This option vested immediately. Excludes the option to purchase 0.6 fractional shares resulting from a December 2010 1-for-10 reverse stock split.
(15)	This option vested immediately. Excludes the option to purchase 0.4 fractional shares resulting from a December 2010 1-for-10 reverse stock split.
(16)	This option vested immediately. Excludes the option to purchase 0.9 fractional shares resulting from a December 2010 1-for-10 reverse stock split.
(17)	This option vested immediately. Excludes the option to purchase 0.1 fractional shares resulting from a December 2010 1-for-10 reverse stock split.

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