Two was our limit, and then Samson moved in under our house. At the time we lived in the country, and evidently someone dropped him off. We started feeding him because his meows were so pitiful. (He evidently was not much of a mouser either, because he was thin. He has long, black hair, which at that point was dull and somewhat matted.) When he started to trust us, we would bring him inside to feed him, keeping him separated from our other two. It was obvious he had been in a house before. He jumped right up on the couch between my husband and me, rolled over on his back, and gave us that "I need a belly rub" look. Of course, we took him for a vet exam and shots, and then he moved in. We were absolutely amazed because we kept him isolated from Saphirah and Chloe for a few days, but when we decided to introduce them and see their reactions, there pretty much weren't any. He has had a very positive effect on our feline household. He has also become a beautiful, rather plump kitty. We still joke that we have too many cats, but we love all three, and really wouldn't change anything.