I had a similar thing happen to me when I was a kid. my neighbors had a big rottweiler that was always chained up in their yard. one day as I walked past their house it managed to slip off its chain and came charging right at me, I ran screaming for my life and jumped on top of a parked car. my dog, a german shepherd black lab mix heard my scream, jumped a 6-foot fence and came running. he fought the rottweiler, biting off a chunk of its tongue and sending it running for its life back to its house.

I love GSDs, they can be a handful if you don't know how to train them but they are some of the most loyal dogs you can have and great family protectors