Cats don't take long to mate---they can do it so fast you won't see it if your back is turned. They aren't like dogs who need to tie for half an hour. So I wouldn't rely on supervision to prevent mating. And males can retain sperm for awhile after neutering, so even if he were done right away they would still need to be separated. To be honest, I think the best thing would be to have the female spayed right away. It's a lot healthier for her. And especially if she's timid, because the stress of having babies might be detrimental to her, and the babies might inherit the timidness. There are usually a lot of kittens available every spring, I don't think there will be any trouble finding one for the people who want a kitten.
Oh, and if the neighbor's cat is able to get into your house, and he isn't neutered, there could very well be a paternity issue .
Oh, and if the neighbor's cat is able to get into your house, and he isn't neutered, there could very well be a paternity issue .
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