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Why do I have to have a Heartworm Test if my pet is on heartworm prevention?

Why do I have to have a Heartworm Test if my pet is on heartworm prevention?

It is important to have an annual heartworm test to be sure your pet does not have heartworm. Your pet could still get heartworm even if it takes prevention year round. If your pet does have heartworms, it will need to be treated.

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