• Hi, I missed a month (for November) of my dogs Trifexis. In the next two days is the day he should have another dose. Should I take him to get screened for heartworms first or is it safe for him to continue like normal for this month?

    Hi Taylor,
    I recommend that you call and talk to your local Banfield Hospital about this question. In most cases if it is just one missed dose it is fine to go ahead and give the medication. The biggest concern with heartworm prevention would be if the dog has adult heartworms. The heartworm lifecycle is 6-8 months to go from mosquito bite to adult heartworms so missing one month should not cause any reactions. Your vet may recommend retesting in 6-8 months to make sure that he is still negative at that time.


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