DD has multiple cats and one young cat decided to torment an new older cat. Nothing she tried would stop it. When one of the other cats died, the torment stopped. The vet said there was one too many cats for the tormentors liking and he picked on one to show his dislike, but who knows, cats have amazing different personalities and they act out how they feel. Now the two cats get along fine. She is always finding strays and finds them a home,(they have an outside living area) much to her DH's dismay. He wasn't a cat person at all when they married. DD told him that was sad and to get over it. He brought a stray kitten home so he sure got over it! LOL