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My new cat won't stop attacking my old cat. What can I do?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 15 lbs

My partner and I moved in together 6 months ago, and we've been trying to get our cats to get along. We introduced them slowly like we're supposed to - keeping them separated at first, switching rooms to let them get used to each other's scent, and introducing them slowly. But one of them, Donut, won't stop attacking the other, Mona, literally every time he sees her. Mona is very small and timid and Donut is big and tough. Is there any way we can get them to tolerate each other without fighting?

1 Answer

Most Helpful Answer

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Answered By Megan, DVM, CVA

Veterinarian

Published on May 25th, 2018

I would recommend to add some feliway multicat household in your house. I would also consider putting Donut on an anti-anxiety medicine to help calm him down. You can talk to your vet and they can prescribe something to try. I hope this helps. https://www.feliway.com/us/Products/FELIWAY-MultiCat-Diffuser

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