The American Heartworm Society recommends year-round administration of heartworm preventative products, given at the same time every month, as the only way to protect against heartworm disease. If your dog is infected after monthly administration of Heartgard, Valley Vet Supply will help with treatment costs providing the following criteria are met:

Dogs starting Heartgard between 6 weeks and 4 months of age:

Your pet, for which the medication was prescribed, must have been on Heartgard for at least nine (9) continuous months without a skipped dose, and the product must have been purchased from Valley Vet Supply.

Dogs starting Heartgard between 4 and 6 months of age:

Your pet, for which the medication was prescribed, must have a negative antigen test 6 months after the first dose of Heartgard is administered, must have been on Heartgard for at least nine (9) continuous months without a skipped dose, and the product must have been purchased from Valley Vet Supply.

Dogs starting on Heartgard after 6 months of age:

Your pet, for which the medication was prescribed, must have a negative antigen test prior to the first dose of Heartgard and a second negative antigen test 6 months later to prove negative status, must have been on Heartgard for at least nine (9) continuous months without a skipped dose, and the product must have been purchased from Valley Vet Supply.

To apply for compensation, you will need to provide:

  1. Proof of negative heartworm antigen test(s) as indicated above and dog’s weight.
  2. Two positive tests must be provided on two separate blood samples.
  3. Valley Vet Supply will reimburse up to $500 for treatment of heartworm infection. Provide your veterinary clinic invoice for treatment of heartworms for that specific pet.


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