I got me a purebred German Shepherd Dog myself.
Her lineage is from Germany, her dad was a fucking beast.
He scared the shit out of me when I first met the pups.
She's a sweet dog though - she knows when and where
to turn it on, but she doesn't get rowdy all the time.
Gun powder will make those balls useless, and can tear the
dog's intestines up. Beefing up a dog and making it mean is
not that hard to do, high protein, lots of exercise, and treating
it like shit while maintaining your spot as head of the pack.
I don't recommend it though, GSDs are smart enough to be
lethal and do what you want without abusing it.
Train it like a drug dog, use its favorite thing, the ball,
to train it on everything and it will do whatever you want
to get that ball or ball smell.