He can still scare the **** out of other dogs, making them DA. I would get him well trained and make him ball crazy. Once that is done he probably won't care about other dogs.
I am always worried about running into these kind of dogs if I have a young dog.
And it gives the breed a bad name. It is scary for the average dog owner to see an out of control adult GSD run up to them and bully their dog. So yes, I would avoid the DPs.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015