
The normal guide for feeding dogs on a raw diet is to feed 2-3% of their body weight and adjust up or down if they put on or lose weight. A pup is normally fed 10% of it's body weight or 2-3% of the predicted adult weight for the breed.
So this would mean that your older dog should be getting between 2-3lb of food a day which is based on 2-3%. As all dogs are different the amounts can vary per individual dog and should be adjusted accordingly. What is the predicted average weight of your pup when it reaches adulthood?
I have been feeding a raw diet for the past 10 months (a large breed who started on raw at 8 months old) so am not as experienced as some other members of this site but am sure other people with more experience will be able to give you more info.