He looks like a mix to me too. His snout appears to be shorter than a pure GSD's snout.
Lila mit der Floppy-Ohr
Teddy the Fearless
Chaz the Spaz
Pokey - you don't know what you've got 'till it's gone
Zoey - may you catch the UPS man
Auggie -may you find the peace you never had