My daughter has two neutered male house cats, and we've successfully brooded 6 groups of babies in the house without a problem. I was nervous at first because her cats kill and eat mice that are unfortunate enough to get in the house, so I didn't know how they would react to the babies. Fortunately, and to my surprise, they never regarded the babies as prey, even on those rare occasions when the door to the "chick room" was accidentally left open or one of the cats got shut in. One is even motherly toward them! I haven't tried it personally, but I think the idea of having a coop cat is an excellent one...depending on the individual temperament of the cat, of course!