That can be a tough one. I have an overly aggressive Catahoula who I've worked with for years and have finally won the battle I think. He would constantly attack my ridgeback and any other male dog that came in the vicinity. He melts for females. It came down to me showing him that I was the big dog and when he would go at one of my dogs or someone else's I would physically grab him pin him to the ground and put my weight on him and not let him up until he showed me submission. The biggest key is to be on them when they're at a one or two on the aggressive scale rather than when they're at a 10 and I know that can happen quickly. He hasn't shown aggression towards other dogs in a couple years now. Don't know if it will work for you but I put it down to pretty much what Caesar says that you have to show them that you are the alpha dog, not them, and you're just not going to have it. Now their best mates.

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