It sounds like your cat is a package of a bunch of behaviors; extreme alpha tendencies, extremely territorial, feral tendencies,and perhaps learned behavior that has been tolerated for almost 6 years. Even if you got a cat who's a bigger bully than this one, he wouldn't learn his lesson. It would literally be a fight to the death. Some cats do not enjoy living with other cats. Have you seen strays in your yard? This could be misplaced aggression. He wants to attack the outside cats but uses your other cats as a substitute. Speak with your vet about a short course of cat anti-depressents and some behavioral counselling. You can also try a plug-in pheromone called "Feli-way" but I've used it with mixed-results. When you see him about to attack, either remove him or the other cats if you can. He is reacting viscerally and I doubt if anything short of distracting and/or removing him from the area would help.

Izadore (Izzie) answered on 1/25/12. Helpful? / 0