Ownership Submission
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 *
  Gilson Todd M
 2. Date of Event Requiring Statement (Month/Day/Year)
03/05/2007		 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)
VP, Marketing
 5. If Amendment, Date Original Filed(Month/Day/Year)
03/09/2007
(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)

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) 07/25/2005(1) 07/25/2015 Common Stock 15,000 $ 0.75 D  
Incentive Stock Option (right to buy) 03/30/2005(1) 03/30/2015 Common Stock 10,900 $ 0.88 D  
Incentive Stock Option (right to buy) 01/03/2005(2) 01/03/2015 Common Stock 10,000 $ 1.17 D  
Incentive Stock Option (right to buy) 12/15/2005(1) 12/15/2015 Common Stock 30,000 $ 1.25 D  
Incentive Stock Option (right to buy) 08/25/2003(3) 08/25/2013 Common Stock 4,529 $ 1.35 D  
Incentive Stock Option (right to buy) 05/18/2004(4) 05/18/2014 Common Stock 4,000 $ 1.59 D  
Incentive Stock Option (right to buy) 11/17/2006(1) 11/17/2016 Common Stock 50,000 $ 1.717 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Gilson Todd M
3760 ROCKY MOUNTAIN AVENUE
LOVELAND, CO 80538		       VP, Marketing  

Signatures

Todd M. Gilson, by power of attorney 03/14/2007
**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) Option granted is immediately exercisable.
(2) This option vested monthly in equal installments over four (4) years through January 3, 2009. Vesting was accelerated to full vest on March 30, 2005.
(3) One-eighth of the shares vested on February 25, 2004, the remaining shares vested monthly in equal installments through August 25, 2007. Vesting was accelerated to full vest on December 2, 2004.
(4) This option vested monthly in equal installments over four (4) years through January 5, 2008. Vesting was accelerated to full vest on December 2, 2004.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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