He's gorgeous! How big is he? Do you have any shots from the side with him standing up? It would be easier then to guess on his breed. I see JRT and not sure what else. I definitely wouldn't have guessed GSD based on the pictures, though.
EDIT: Also, if this helps, he's about 50 lbs. He's already past a year old, so I doubt he'll get any bigger than this!
EDIT2: I owe Toby an apology. This is an ugly old couch that fiance refuses to get rid of because he's had it since he was a child. Ummmm, it's ugly and the arm is torn up. GET RID OF IT! Sorry, Toby, for forgetting that your dad was the real culprit here. LOL.