I would say give him a little more. My breeder starts and keeps her puppies on adult food, so Wolfie ( who is 4 months old ) has always eaten adult food. He eats 4 cups a day split into 2 meals, so 2 cups at a time. He was having 3 cups a day, and was bringing me his bowl when he was done, and always seemed starving. I upped his food an extra 1/2 cup per serving and that did the trick.
Chases Wolfgang Heinrich Von Ryan aka Wolfie born 12/20/09
Waiting for us at the bridge is Chases Chieftain aka Chiefy Left this earth and left a hole in our hearts July 2000