He does not look pure GSD to me. His muzzle is too wide/fat. Likely Rott, Lab, or Shar Pei influence. Ears probably won't stand on their own- if you want them to I would start taping now. No way you can get them to stand after 4/5 mos if they aren't on their own.
Danielle, owner of...
Fraggle Rock Collars
Fraggle Vom Richcreek CGC CA
Red Dog's Reconnaissance Man CGC
General Patton Vom Winter Storm