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Why does my pet need to be examined within the last year in order to refill their heartworm prevention?

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Heartworm prevention is a prescription medication and therefore requires an annual examination and negative heartworm test in order for CHAI to approve a refill. At the examination, we will ensure your pet is healthy, has not contracted heartworm disease during the last year, and we will get an updated weight to ensure their dosage is correct.

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