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Why is my cat aggressive towards his sister after a vet visit?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 4 years and 5 months old | 11 lbs

My Male cat had to stay at the vets most of the day today & when we came home his sister/litter mate is very hostile towards him. We are trying to keep them separated as much as possible however we currently only have 1 litterbox so I cant keep one away. Any suggestions?

1 Answer

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on January 31st, 2019

Cats exhibit this behavior sometimes when one leaves the house. Most of the time it’s more growling and hissing and running then anything else. Most cats will get over this quickly. Supervise them so that they don’t hurt each other and make sure one does not bully the other. If you have something they really like it such as canned cat food, you could try feeding both cats the food or treats close to each other and talking sweetly and petting both. I hope this helps and best of luck!

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