I have had some quite intelligent breeds of dogs in my lifetime. So with my first GSD I expected nearly the same behaviors and learning patterns. I ended up in the same amazement as you when I brought my pup home quite early & within 3-4 days she had potty broke herself. I started training earlier than usual & by 10wks she was saying momma. Must be something to the potty thing. Post some pics for us! Be sure to share milestones & tricks with us, we love to hear about them. Congrats on the smart little pup, wish they all learned so easily.
Sable GSD 3/2014
Stewart Australian Shepherd 5/2006
Babe Daschund 2/2006