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My dog ate Tylenol PM. Is it dangerous for dogs and what should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Peekapoo | Male | neutered | 11 years and 5 months old | 15 lbs

My 15lbs 12 year old peek-poo ingested a very small amount of tylonol pm

1 Answer

Most Helpful Answer

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Answered By Anna M., DVM

Veterinarian

Published on April 3rd, 2019

Hello, and thanks for your question about Louie. The "diphenhydramine" (or the "P.M. portion of tylenol PM) has a pretty wide spectrum of safety, but the tylenol (acetaminophen) does worry me, depending on the dose Louie may have gotten. We can start to see side effects of tylenol in dogs from 40 mg/kg which would be about 270 mg for Louie's listed body weight. So, depending on the strength of Tyleon PM that you have (many of them contain 500mg of acetaminophen), if he may have eaten even a single tablet, that's enough to warrant a vet visit. Given the possible risk, I recommend bringing Louie right in to the vet. They will likely induce vomiting to get it out of his stomach, or start protective GI medications to minimize his absorption of it, depending on when the exposure occurred. Hope this helps and best of luck to you and Louie!

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