My dog took heartworm pill by accident, no test. Will he be okay?

Question

I accidentally gave my dog a heartworm pill, thinking I was giving g a flea pill. The problem is I haven't given him one since October, and haven't had a heartworm test since beginning of last year! I'm worried sick I have harmed my boy!! Pet's info: Dog | Pit Bull Terrier | Male | neutered | 85 lbs

Angel Alvarado, LVT · Accepted Answer

Murphy should be fine, especially if you are not in a heartworm endemic area. The meds will kill any circulating juveniles (microfilariae). Be sure to have him properly tested before the next dose. It takes 5-8 months for a female heartworm to mature into a reproducing adult. Ideally, every dog should be tested every 6 months but since most dogs are on meds year round (for the added intestinal parasite protection), once yearly testing is typical.

My dog took heartworm pill by accident, no test. Will he be okay?

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