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My dog accidentally got too much penicillin. Will she be okay?

Updated On September 23rd, 2025

Pet's info: Dog | Newfoundland | Female | spayed | 115 lbs

I gave my 115lb dog 10 ml injectable penicillin by mistake will she be ok

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on May 21st, 2018

She will likely be ok, however she could get diarrhea since the penicillin in this 10-fold overdose likely killed every single bacterium in your dog including the good bacteria in the digestive system. Depending on whether this was a long-acting or short acting penicillin you should wait a few days and add some probiotics to her food to help reestablish a healthy intestinal flora.

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