Did you get a chance to look at this yet ---> Pup doesn't want to eat (picky eater?)
As long as a vet visit says your dog is otherwise healthy, picky GSD's are NOT uncommon. I know my dog lost over 5 pounds when she was already too skinny when I just tried to tough it out instead of adding food she DID like to her meals.
Look at the site for other good ideas to get your pup to start eating again.
MACH3 Bretta Lee Wildhaus MXG MJG MXF MFB TQX HIT CGC TC
Glory B Wildhaus AX, AXJ, XF
"It is absurd to divide people into good and bad. People are either charming or tedious." - Oscar Wilde