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What Not To Do

• If your cats are fighting, don't allow the fights to continue. Because cats are so territorial, and because they don't establish firm dominance hierarchies, they won't be able to "work things out" as dogs sometimes do. The more often cats fight, the worse the problem is likely to become. To stop a fight in progress, make a loud noise, such as blowing a whistle, squirting the cats with water or throwing something soft at them. Don't try to pull them apart.
• Prevent future fights. This may mean keeping the cats totally separated from each other while you're working on the problem, or at least preventing contact between them in situations likely to trigger a fight.
• Don't try to punish the cats involved. Punishment is likely to elicit further aggression and fearful responses, which will only make the problem worse. If you attempt punishment, you may become a target for redirected and defensive aggression.

Because their social organization is somewhat flexible, some cats are relatively tolerant of sharing their house and territory with multiple cats. It's not uncommon for a cat to tolerate some cats, but not get along with others in the house. However, the more cats sharing the same territory, the more likely it is that some of your cats will begin fighting with each other.

When you introduce cats to each other, one of them may send "play" signals, which can be misinterpreted by the other cat. If those signals are interpreted as aggression by one of the cats, then you should handle the situation as "aggressive."

The factors that determine how well cats will get along together are not fully understood. Cats that are well-socialized (they had pleasant experiences with other cats during kittenhood) will likely be more sociable than those that haven't been around many other cats. On the other hand, "street cats" that are in the habit of fighting with other cats in order to defend their territory and food resources may not do well in a multi-cat household. Genetic factors also influence a cat's temperament, so friendly parents are probably more likely to produce friendly offspring.