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"If an adult cat has gone from being extremely docile to extremely aggressive and nothing has changed in his living situation, his diet, or his environment, there could be an underlying medical reason for his behavior. Cats are notorious for their ability to hide pain, and the pet could be suffering from severe discomfort due to injury, illness, infection, or even tumors.  Before attempting behavior modifications, make an appointment with your veterinarian to discover any possible medial reasons for the cat&amp;rsquo;s sudden change in temperament."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Cats/Behavior/Aggression.aspx>