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My boy kitten attacks new girl kitten. How to introduce them?

Updated On September 23rd, 2025

Pet's info: Cat | British Shorthair | Male | unneutered

I have 11 week old boy kitten and have just baught a 8 week old girl kitten. I have done my best to keep them seperated however the boy kitten is obsessed with getting into her room. There have been times where he has gotten into her room and every time he does he just straight away bites her neck and then they kick and night one another and even if she hisses he will not leave her alone unless I separate them again. Any advice would be great

4 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 16th, 2020

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.

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1Pet Parents found this answer helpful

Related Answers from Veterinarians

  • Image profile

    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on August 5th, 2019

    Yes, they can get along! You just have to introduce the kitten slowly to your other cats. 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. Best of luck.

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    1Pet Parents found this answer helpful

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on April 16th, 2018

    I would separate the cats, 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. 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 aggressive cat's room while the aggressive cat 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 aggressive cat out of his room, and see how he 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 cat in his room when you go out until they are comfortable with each other. Best of luck, I hope this helps!

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    1Pet Parents found this answer helpful

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on April 11th, 2017

    Great question! I will give you a method I typically recommend for introducing new cats to each other. 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 Keanu 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 Keanu 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 Keanu. 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.

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    1Pet Parents found this answer helpful

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