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How to introduce my returning cat to a new cat in a small home?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 7 years and 4 months old | 5 lbs

When I had to move from my old apartment, into hospital and then to another apartment, I left my cat behind. She was very settled, the owner liked and was feeding her, and she very attached to the owner´s own cat. It didn´t seem fair to uproot her. But now the owner has told me I must take her away. In my new place, a young stray cat has moved in with me. I love my original cat dearly, and must take her, but I don´t know how she will cope, in a small apartment and with a new cat around.

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on May 3rd, 2018

Hi, thanks for using PetCoach!

I would be sure that the new and old cat are up to date on vaccines and deworming before coming in to contact. Then I would take the older cat and place her in a separate room or bathroom with a liter box and food and water for 7-14 days. Basically until she seems acclimated. I would purchase a Feliway diffuser, one for the room she is in and one in a location that the new cat can smell it. They can get used to each other by sniffing and hearing each other under the door. After the 7-14 days put the older cat in a cat carrier or use a baby gate at the door so they can see each other and hiss/growl if needed safely. Again for 7-14 days. Then let her out when you are home to supervise. Once that goes well they can be left together alone. You may be surprised out quickly she gets comfortable.

I wish you the best!

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