For us, most stare and eventually ask if he is friendly and can they pet him. They usually ask how old he is, where I got him, and if he is purebred because "he's so big and red, and has that black spot on his tongue!"
I don't usually get negative responses to him when people talk to me, I have gotten, on a number of occassions, people crossing the street when we run, or picking their mini-___ up as we walk by. But that's really it.. sometimes I get the crazy dog people that try to tell me how to train them and what they "know" about GSDs and dog behavior.
Commander Charly Titan (GSD)-15 Jan 2010