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I have 2 male cats they are both neutered. 1 is 2(Tommy) & the other is about a year maybe a year & a half(Nelly)we just got a new kitten it’s a female & she’s bout 3 months & Nelly don’t mind it they get along but tommy growl at her & hiss & swat at her & won’t even come inside if he sees her. He’ll peak his head in the door & look to see if he sees her & if he does he wont come inside when she sleep he’ll come inside but once he realizes she’s there he growls,hisses,& wants out ASAP.

I have 2 male cats they are both neutered. 1 is 2(Tommy) & the other is about a year maybe a year & a half(Nelly)we just got a new kitten it’s a female & she’s bout 3 months & Nelly don’t mind it they get along but tommy growl at her & hiss & swat at her & won’t even come inside if he sees her. He’ll peak his head in the door & look to see if he sees her & if he does he wont come inside when she sleep he’ll come inside but once he realizes she’s there he growls,hisses,& wants out ASAP.

Updated On June 13th, 2023

Pet's info: Cat | American Shorthair | Male | neutered | 2 years old | 11 lbs

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Answered By Dr. Melanie, BVSc MS

Veterinarian

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Thank you for contacting PetCoach with your question. This is a pretty common problem. I would slowly introduce them to each other. Take the kitten, and put her in her own room with her own food, water, and litter box. Keep the door closed, and for a few days, feed them both treats on other side of door so they associate each other's smell with a good experience. Then let the other cat in the kitten's room while the kitten is in a cat carrier. They can smell each other, but not be in contact. If either becomes upset or show signs of aggression, remove the second cat from the room, and try again later. Praise them when they interact appropriately. When they are interacting well with each other through the carrier, you can let the kitten out of her room, and see how she interacts with the other cat. Praise them when they interact appropriately, and separate them with any sign of aggression or upset. I would get a cat tree with lots of shelves to give the cats vertical space to get away from each other. I would keep the kitten in her room when you go out until they are comfortable with each other. I hope this helps!

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