- 1). Lift the cat's tail and view its reproductive anatomy. There should be two openings: The one closest to the tail is the anus and the other is either the vagina or an opening that houses the penis.
- 2). Search for testicles. After a male cat is six to 10 weeks old, his testicles should be visible if he hasn't been neutered.
- 3). Compare the two openings if no testicles are present. In females, the vagina is a vertical slit that is very close to the anus. In males, the penis is housed in a circular hole that is at least 1/2 inch from the anus in male kittens, and closer to 1 inch in adults.
- 4). Take the cat to the vet if you are unable to determine the sex.
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