I have a large number of indoor cats. First get the cats spayed or neutered. This will lessen the number of fights.But will not stop all fighting. Many of my cats are litter mates. There will always be a alpha male or female. I have found that simply placing the aggressor in a small room, a half bath works well and close the door. Leave the cat in there for at least a half hour. The cat may meow or scratch at the door. The other cats tend to sit outside the closed door. But do this quickly. A cats attention span is very short. After several trips to the "jail". The bully will learn what happens if he or she is the bully.
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