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Defensive Aggression: Defensive aggression occurs when a cat is attempting to protect himself from an attack he believes he cannot escape. This can occur in response to punishment or the threat of punishment from a person, an attack or attempted attack from another cat, or any time he feels threatened or afraid. Defensive postures include crouching with the legs pulled in under the body, laying the ears back, tucking the tail and possibly rolling slightly to the side. This is not the same as the submissive postures dogs show because it's not intended to "turn off" an attack from another cat. Continuing to approach a cat that's in this posture is likely to precipitate an attack.

Redirected Aggression: This type of aggression is directed toward another animal that didn't initially provoke the behavior. For example, a household cat sitting in the window may see an outdoor cat walk across the front yard. Because he can't attack the outdoor cat, he may instead turn and attack the other family cat that's sitting next to him in the window. Redirected aggression can be either offensive or defensive in nature.

What You Can Do

• If your cat's behavior changes suddenly, your first step should always be to contact your veterinarian for a thorough health examination. Cats often hide symptoms of illness until they're seriously ill. Any change in behavior may be an early indication of a medical problem.
• Spay or neuter any intact pets in your home. The behavior of one intact animal can affect all of your pets.
• Start the slow introduction process over from the beginning. You may need professional help from an animal-behavior specialist to implement these techniques successfully.
• In extreme cases, consult with your veterinarian about medicating your cats while you're working with them on a behavior-modification program. Your veterinarian is the only person who is licensed and qualified to prescribe any medication for your cats. Don't attempt to give your cat any over-the-counter or prescription medication without consulting with your veterinarian. Animals don't respond to drugs the same way people do, and a medication that may be safe for a human could be fatal to an animal. Keep in mind that medication, by itself, isn't a permanent solution, and should only be used in conjunction with behavior modification.

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