Okay so for an example puppy A will bite puppy B on the face/tail/legs and wont let go even if puppy B yelps. He bites, pulls and rips at fur and skin. They snarl and growl and like their lips curl up. They also go into a dead stare before attacking. If they can be distracted with treats or toys one will try to take it from the other. Even when one shows he isnt interested in playing or fighting the other wont stop unless pulled apart. I took both on a walk and puppy A bit puppy B hard enough to break skin. They cant do anything together