Are you sure it was a real fight and not just rough play?
My GSD and my Dalmatian get really loud and make terrible noises when they are playing, they look like they are really fighting but they are not. My GSD literally sounds like an angry bear when they wrestle.
Sinister ~ 5 yr old black male GSD 3.11.09
Draco ~ 9 mth old male Dalmatian 6.30.13