Thats why my dogs are seperated. Caza is alpha and Neeko started to change his mellow ways and has been "challenging" Caza. So they dont play together anymore. I really am not looking to break up dog fights everyday. And my dogs are big, VERY strong dogs. Neeko is almost 90lbs and Caza is over 100lbs (he's too big, it really hinders his woking ability because he is not as agile and quick as the smaller dogs). The last straw was when they got into it for no operant reason (I am ALWAYS watching my dogs if I am running them together) and Neeko just "attacked" and Caza being alpha decided to fight back. It took 5 people to pry them off each other, we tried to leash thing where we wrap it under their legs, and they were still holding each other, then we tried a water hose didnt work, eventually my grandmother said "scr*w this" grabbed a 2by4 and bashed them on the head (something that should ONLY be done if the dog's lives are at risk and there is no way to pry thm off). That fight was a fight I will NEVER forget, and lets just say I didnt get a paycheck that week (or the following week), all my money went towards vet bills. So now I dont even take chaces. Do not leave your dogs together unless you are 100% positive they will not get into it, the trouble isnt worth it.