How to Stop a New Cat From Being Aggressive to Other Cats In the Home

A successful introduction can help your cats become comfortable with each other.
i cats 2 image by Dusan Radivojevic from

Whether fostering, pet-sitting or bringing a new cat into your home, take steps to ensure a successful introduction. Reducing or eliminating aggression between the cats from the very beginning can set the tone for a good bond between the cats later and avoid long-term negative effects in your cat household.

Step 1

Set up a secure room for the new cat. Fill a water bowl, food dish and litter pan for the new cat. Place these items in a room where your new cat will live for at least the first week. The room should have a door that latches securely so that the new cat will stay in and the household cats will stay out. This will give your new cat time to become settled in the new environment and reduce aggression between the cats.

Step 2

Encourage the cats to smell each other. Pet the new cat and immediately after, pet the household cats. Do this several times a day. Brush the cats with the same brush. Allow the cats to sniff each other under the door of the new cat's room. Allow the cats to smell each other, but not see each other, for at least one week.

Step 3

Move all cats to a neutral space for their first face-to-face introduction. If there is not neutral space in your home, consider taking them to your car or to a friend's home for the introduction. Break up any fights immediately by spraying the fighting cats with water. Give the cats treats and attention together in the neutral space.

Step 4

Open the door between the new cat's room and the rest of the house. If there is no aggression and the cats seem to tolerate each other, you can allow them to live together permanently. Keep an eye on the cats for the first few days.

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