It doesn't matter what the breed is...things escalate really quickly between dogs. Boys will be boys, and things happen. The biggest problem I see in this situation is the size of the room the dogs are kept in. If you don't give a dog a chance to escape, leave a situation, many times you'll see a fight break out. A dog might've tried to get away, but the room is too small and the other one easily cornered it or was able to continue doing whatever it was doing.
Pick a different day care...or just don't take your dog to one. My dog got kicked out of daycare at 5 months of age because he would boss dogs twice his size around and corner them. He also wouldn't really listen to anyone but me so the "handlers" were too worried to do anything.