I have a cat who's neurotic. When we trying to accommodate another cat, she hissed and growled the whole time. She was upset to the point of having part of her intestines inflamed. We rehomed the other cat. She now puts up with my daughter's cat. She freaks out at my husband being around.

My daughter's cat isn't neurotic but is very territorial. We can't set up boxes for the cats to play in because she would try to guard them all.

Still good cats and still want them around.