SEC FORM 3

SEC Form 3

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
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Zachara Claudine

(Last)

(First)

(Middle)

3760 ROCKY MOUNTAIN AVENUE

(Street)

LOVELAND

80538

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
05/02/2011

3. Issuer Name and Ticker or Trading Symbol
HESKA CORP [ HSKA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	VP, Marketing

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	20	D

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: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Incentive Stock Option (right to buy)⁽¹⁾	11/04/2008	11/03/2018	Common Stock	900	$4.4	D
Incentive Stock Option (right to buy)⁽²⁾	11/10/2009	11/09/2019	Common Stock	2,000	$4.5	D
Incentive Stock Option (right to buy)⁽³⁾	12/31/2010	12/30/2020	Common Stock	4,500	$4.96	D
Incentive Stock Option (right to buy)⁽⁴⁾	09/14/2009	09/13/2019	Common Stock	2,500	$5	D
Incentive Stock Option (right to buy)⁽⁵⁾	03/30/2005	03/30/2015	Common Stock	708	$8.8	D
Incentive Stock Option (right to buy)⁽⁶⁾	04/10/2003	04/10/2013	Common Stock	600	$9.5	D
Incentive Stock Option (right to buy)⁽⁷⁾	02/05/2002	02/05/2012	Common Stock	1,050	$10.6	D
Incentive Stock Option (right to buy)⁽⁸⁾	05/18/2004	05/18/2014	Common Stock	750	$15.9	D

Explanation of Responses:

1. This option vests and becomes exercisable in monthly equal installments over four (4) years through November 4, 2012.

2. This option vests and becomes exercisable in monthly equal installments over four (4) years through November 10, 2013.

3. This option vests and becomes exercisable in monthly equal installments over four (4) years through December 31, 2014.

4. This option vests and becomes exercisable in monthly equal installments over four (4) years through September 14, 2013.

5. This option vested immediately. Excludes the option purchase 0.5 fractional shares resulting from a December 2010 1-for-10 reverse stock split.

6. 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. Excludes the option to purchase 0.5 fractional shares resulting from a December 2010 1-for-10 reverse stock split.

7. 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. Excludes the option to purchase 0.9 fractional shares resulting from a December 2010 1-for-10 reverse stock split.

8. 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.

	By: Jason A. Napolitano For: Claudine Zachara	05/04/2011
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.