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My cats fight after a temporary cat left. How can I make them friends?

Updated On September 23rd, 2025

Pet's info: Cat | Siamese | Female | spayed | 1 year and 10 months old | 8 lbs

My two cats used to get along well, 8 year old boy and 1 year old girl. But I took in my syster in law cat for 6 months while she got her new place. Then my cats started to hiss and argue the new cat, plus at each other. The cat I was taking care off is now gone, but my cats still dont get along and they used to before. Now they cant even be in the same room because the 1 year old will hiss and run and then the older cat will chase her. What can I do to make the relationship better again?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on September 5th, 2019

I would separate them, and slowly reintroduce them to each other. Take the cat who is aggressive, and put him in his own room with his own food, water, and litter box. For a few days, feed them both treats under the door so they associate each other with a good thing. Then let your female into the room while your male is in a carrier. Praise them when they interact without aggression, and take the female out of the male acts aggressive. Once they get along that way, you can let the make out of his room to see how things go. I hope this helps!

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