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My older cat is stressed by a new kitten and won't eat. What to do?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 5 years old | 15 lbs

hello, I have a question regarding my cat's behavior. about two weeks ago I've adopted a 3.5 months old male kitten. my other cat (5 years old male) refuses to eat the second he sees the kitten, or to get inside the house. he has lost his apetite, is apathetic, sometimes would hiss and try to attack me when I tried to pick him up. what can I do to make him comfortable in his own territory and less stressed?

2 Answers

Most Helpful Answer

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Answered By Susan England-Foster

Veterinarian

Published on August 17th, 2017

I would recommend trying to keep the kitten and older cat separated for now. Than slowly introducing them back to each other. I would make sure that the older cat has a litter box and food some place away from the kitten that way he will feel more comfortable eating. It is very important cats eat every day. If Niko is not eating anything he needs to go see a vet. You can try feliway which is a cat pheromone to help decrease stress in the house too. The reason Niko is acting out is due to stress in the house

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    Answered By Jenny, DVM

    Veterinarian

    Published on July 15th, 2018

    She may be scared or upset about the new kitten. It can take weeks for cats to adjust to new changes and new pets. I would try to confine the new cat to a room so the older cats feels safe to explore again. Then try to reintroduce them again.

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