Some friends/neighbors of ours have a young GSD, don't know if he's snipped or not. But as a puppy, I sat him one night and we had a great time! But now, he wants to attack EVERYONE and EVERYTHING he sees.
Encountered him and his mom on a walk one day, he went nuts. Then he got away from her and came after my Beagle. All he did was bark in his face like a psycho, but I had pistol in-hand and was ready to end his existence if he actually attacked either one if us.
I told Katie he came close to going away right then, and strongly suggested she get a stronger harness and a muzzle, as a lawsuit from an injured party would be far worse than losing the psycho.
Now she walks him with a muzzle and a real friggin' harness.