Everything about his pictures looks GSD. He looks a little over-sized. There really are only a few breeds where double dews are normal. I don't know that I ever had rear dew claws on a GSD, but I wouldn't rule him out for that reason.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.