I have 7 of my own, a number which I have decided to be fixed for now. I have anywhere between two and 10 fosters at any given time; the highest numbers during kitten season. I like my fosters to be in the general population and have discovered that the situation is stable to about twelve cats. (I have a three floor house.) But peeing becomes a problem at times, and I need to quarantine some of the incompatibles.

Kittens never go into the general population until they're altered, if I have them that long. I have several middle aged cats and they don't want any part of bratty kittens. And, frankly, kittens can be destructive!