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How to tell if a cat is neutered
Position your cat.
To check your cat yourself, you need to have access to his buttocks area in order to examine his genital region. You should position your cat with his rear end toward you.
Once he is positioned, you need to pull his tail straight up so you can see his genital region. You may need to get someone to help you if you think your cat will squirm around while you do this.