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My cat mated with her brother. Will she be okay? What will the kittens look like?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | unspayed | 1 year and 6 months old

My cat brother mate with her sister will she die what will the Kitty look like

2 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 6th, 2016

Suzy will not die because she mated with her brother, but there is a higher chance of recessive genes (defective genes) being expressed due to this mating. It's impossible to say what the kittens will look like, but it is never recommended to mate siblings. You can get Suzy spayed now, which will terminate the pregnancy and prevent future matings. I would also neuter her brother.

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on

    She will not die. There should be no problem. Theoretically incest breeding does increase the chances of kittens with birth defects provided the parents have the respective genes, however inbreeding is also used to improve a breed, so I do not think you have to worry. The kittens should look normal.

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