If several of your cats suddenly start fighting when they previously lived together without altercations, the first step is to take them both to your veterinarian for medical evaluation. Medical problems can cause a cat to be in pain, grouchy or confused, which increases the likelihood for aggressive behavior. If a medical evaluation reveals no abnormalities, the following recommendations may help your cats to resolve their differences. These recommendations will also be helpful for cats who have been introduced to each other recently and are not getting along.

