Join Date: Aug 2011
Location: Whitehorse, Yukon
He looks good to me. You may be *slightly* paranoid...:P
He has some nice lean muscle both front and back and an apparent indent after the last rib. The first picture is deceiving because he is drinking and they tend to suck it in when they are eating and drinking.
The second picture looks more true, so going on that picture I think he looks good.
GSD's should be kept lean for life, a little moreso as young dogs. Listen to your pup, he is self regulating. Let him choose how much to eat over 3 days so you can measure it out more accurately, then only give him that amount on a scheduled feeding (I am not a fan of free feeding, but if it works for you, you can do that too). How I do this is take 2 cups and put it in the bowl, let the pup eat as much as he is going to in 10 minutes. Pick the rest up and re-measure, now subtract and you know what he is eating per sitting. Do that for 3 days so you can get an accurate reading of the median amount. This is where you START, you can adjust according to growth, exercise, stress etc.
Increase the food as he grows, or if you notice him searching for more when he is done, and keep an eye on his weight.