German male german shepard weight

Question
I have a 4 month old male german shepard i got th dog from a rescue league. The shepard was very under weight.
He was 17 LBS when i got the dog 3 months old he gained 15 LBS in just 2 weeks.
He weighs 35 LBS. How big should the german male shepard weigh when he is fully grow. He has big paws and long rear
legs.
Kindly let me know.
The vet said that my dog will grow 80 to 90 LBS?

Answer
Cut back on what you are feeding him and switch to an adult chow.  Fast growth and rapid weight gain isn't good for a large breed puppy.  Dogs are very inconsistent about how much they grow later.  The vet's estimate sounds good, but could be way off either way.