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Why is my cat licking his rear and having diarrhea after antibiotic?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered

Hi Puma was taken to the vet a couple days ago, he was given an antibiotic injection and was diagnosed with an upper respiratory infection. He’s been given a medication to be put on the nose, and seems to take it fine, except ever since the needle he has been constantly linking his rear end, there also seems to be small feces that we keep finding around the house, is it because of the needle, it seems unusual at he likely does not act like this.

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1 Answer

Most Helpful Answer

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Answered By Megan, DVM, CVA

Veterinarian

Published on December 15th, 2018

Poor Puma! He is quite the handsome guy BTW! It could just be a weird coincidence but the antibiotic injection could have caused a little upset stomach. When your vet reopens tomorrow I would call and let them know what is going on. They may want to see him again or give him some meds for his tummy if needed. Plus, if he is having a minor reaction to the antibiotic (which is really rare), they make want to notate it on his chart. You can give him a teaspoon of pumpkin to see if this Helps as well. I hope this helps.

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