GSD is only 50 lbs at 10 months

by jeremy
(seattle )

My female GSD is only 50 lbs at 10 mo. I noticed others (GSD) and they are much bigger at a younger age.

I feed her formm dog food which is not the top brand but almost and still she looks so small.

Why? Will she ever get any bigger? Her mom was 100 lbs and her dad was 137 lbs but she is not even close to any of them. By the way she's going, she's going to be smaller then a boxer.