Still only a young pup,and protein is still very high up on the list of demands for anything that's growing at such a fast rate
If the protein levels are too high the opposite will happen and the pup will be growing too quick, bad diet at an early age can result in future problems. A good meat meal is the best as it allows for the dog to grow at a steady pace and steady protein levels, changing foods all the time to different brands causing fluctuations in goodness intake will cause growth spurts, not good for a growing pups bones, tendons, ligaments and muscles.