Dog aggression

Foot in a$$ and shock collar are about the only things i would recommend. Careful with a collar though. I wouldnt shock a dog while its Actually fighting or real close to it because i bet he would associate it with the other dog. I would keep a collar on him and every time he even looked funny at the other dog i'd buzz him with it. And if a fight breaks out thats when he gets the boot. I had an english coonhound that was funny around other males and it helped him. I never had to just beat the hell out if him. I'd just get his attention real good and let him know that i wouldnt put up with it. He cought on real quick.