Yippeee!!!!! Another GSD!!
WELCOME!!! My name is Angie and I am the Pet Talk's local GSD nut!
I have Sierra (Sable) and Buddy (blk n tan) Both were resuces.
Both of mine had problems putting weight on too.
It took Sierra until she turned 4 to start looking "normal" She could never get above the mid 60's. I always had people asking me "Is she sick?" But now she's at 72 and looks great!! She just turned 5 last month.
I had blood work run for Exocrine pancreatic insufficiency or EPI . You should read up on it, and see if it's something you should talk to you vet about. It's very common in GSD's.
My Buddy was only 76 pounds when I adopted him at 1 year old. I finally had him up to a healthy 90 pounds, but just over a month ago he went through a bad spell with worms and wound up in the hospital on an IV and lost 12 pounds. So that knocked him down to 78. Like fighting an uphill battle!
He'll be 4 in December.
What kind of food do you feed him?
How much per day does he get?