I didn't know the dog had returned to the White House since his first banishment. 24 bites! That's just insane -- that's a dog that would have been put down if it belonged to any common citizen.
And, yes -- my family had a German Shepherd when I was growing up. They are not naturally biters -- they react as they are trained (or not trained). Aside from our own GSD, I have known many other folks with GSDs, and with maybe one exception they were all friendly once introduced as "friend." And the one exception wasn't dangerous -- he just didn't tolerate strangers trying to pet him. "You don't bother me, I won't bother you."