UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):  May 26, 2006

HESKA CORPORATION

(Exact name of Registrant as specified in its charter)


Delaware

000-22427
77-0192527
(State or other jurisdiction of (Commission File Number) (I.R.S. Employer
incorporation)   Identification Number)

3760 Rocky Mountain Avenue
Loveland, Colorado 80538

(Address, including zip code, of principal executive offices)

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

Former name or former address, if changed since last report:  Not Applicable

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

[  ]  Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[  ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[  ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[  ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))


Item 1.01       Entry into a Material Definitive Agreement.

         On May 26, 2006, Diamond Animal Health, Inc. (“Diamond”), a wholly-owned subsidiary of Heska Corporation (“Heska”), and Agri Laboratories, Inc. (“AgriLabs”) entered into a Third Amendment (the “Amendment”) to the Amended and Restated Bovine Vaccine Distribution Agreement between Diamond and AgriLabs dated September 30, 2002. The Amendment adjusts AgriLabs’ minimum purchase requirements and extends the maturity date from May 31, 2006 to May 31, 2007 for a $500,000 promissory note from Diamond to AgriLabs.


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 hereunto duly authorized.

    HESKA CORPORATION
a Delaware corporation

Dated:           June 2, 2006
 
By:  /s/Jason A. Napolitano     
JASON A. NAPOLITANO
Executive Vice President and Chief Financial Officer