I'm no expert but.. I have 2 intact Great Pry's. They will fight sometimes and have cut each other in past fights. But, only minor scratches from the battle. I will generally let them work it out. I have stopped it a couple of times. Once when one of them had signaled that he didn't want to fight anymore and the other kept going. And the second time when they were in the house and I didn't want them to fight. I just step between the two of them and they back off. For the most part they really don't fight anymore. One has established dominance and the other backs off from him.