I'm lacking brilliant ideas these days. Sorry. Good luck solving the problem.
Originally Posted by rdl2k5
I'm very pro Cesar Milan. That book should help a lot. How old is your dog? Between the 1st and 2nd year is when most dogs began forming their true aggressive tendencies.
Cesar's book is going to tell you that all of your dogs should walk together every day for 45-1hour every day. I'm not sure how many dogs you have, but that will take a sigifnicant amount of work to walk dogs that big!
Another suggestion he will give is to use a correction collar and to place your dog into uncomfortable situations. For instance, if you know the cats are coming around and know that your dog is about to act out on them, you will correct the dog with the leash.
Some will claim that choke/correction collars are cruel. When used inappropriately they can be dangerous. It is not correct to choke your dog with it or to let them struggle in it. Quick snapping motions are the goal. In dog packs, corrections are made through quick bites to the neck which is simulated through this type of collar or can also be done with your fingers.
Good luck with it. I've had times in my life where I've had to separate dogs in rooms and that's a big pain. Ideally, they would all just get along but that's easier said than done!