My brother has 2 males that never got along, they have to live in seperate areas of the house. Both of them get along well with his female Mastiff. Ekim went to training with a few dogs that were same sex and didn't get along, by a few months they were best of friends. It took a lot of time, patients and hard work. You really need to seek advice of a good trainer, one who has worked with these problems before, not a pet-smart trainer but a behaviorist. My trainer met Ekim when he was 9 weeks old, Ekim was a nasty puppy, always bitting and growling, I was so afraid of him, I thought he was an aggressive dog. My trainer told me that Ekim had a fearful personality and it was not an aggression issue. He told me that in a few months Ekim was going to be my best friend and one of the most gentle, well behaved dog I would ever meet. And he was so right. Ekim is my best friend. And so gentle and well behaved. Now when he came to evaluate Delila, she is a more dominant dog, I have to train her in a completely different way than I trained Ekim. It is a wonder how this guy can read dogs, but the first time he met Ekim I told him I wanted to get rid of him as I was afraid of all big dogs and he was a terror always bitting, jumping and growling.I told him he was the meanest dog I met. He told me Ekim didn't have a mean bone in his body and he was right. How he knew is beyond me because Ekim was killing me. What I am saying is get a good trainer to help and do it soon, my brother waited to long to correct his problem and the dogs never got along. The more fights that occur the harder it is to correct. Dogs don't forget. With a good trainer your babies will become good buddies I am sure, they are still young enough to correct, and these injuries seemed very severe.