That is entirely dependent on his metabolism and his activity level. Are you feeding a puppy food kibble? If so, start with the guidelines on the bag and adjust from there if your dog looks too skinny or overweight. If you're feeding adult kibble, add 50% to the recommended feeding for an adult dog of the same weight as your puppy. If you're feeding raw, I have no idea what to tell you. Maybe one of our raw-feeders here could help you.