The Administrator from the Great White North, eh?
Join Date: Jun 2006
Location: Northern British Columbia
The GSD standard allows for quite some variation in size. You may just have a small puppy that is on the lower end of the standard. What you feed should be enough - if your pup is healthy, active, happy, and eats well, then I wouldn't worry about his size.
He may still put on 10 to 20 lbs as he matures, so that would bring him to 65 lbs which is a normal size on the lower end of the spectrum. I know some pure-bred females that are barely 50 lbs - so though small, nothing abnormal about your pup.
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Keeta BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? 2004-2015