I'm sorry that the doggie had to go back to it's owner.

Although I don't believe that 'all' pittys are fighters, a good rule of thumb is to never trust a pitty to not fight. If he's a real dumb a$$ then he's letting the pittys stay together unsupervised and they may very well be snarking at each other and causing those wounds. It's highly dangerous to not seperate pitbulls while you're not there. Any little thing can set them off and once they start fighting, they don't stop. More than once, I've heard stories about people who have had pittys together for years and ond day they come home and find one dog dead and another gravely injured.

At the worst, he's fighting the dogs and needs to be stopped. In this situation, death would be better for the dog. But then he's probably just going to go out and get more dogs.

Good luck and please keep us posted.