If you want him to perform like an athlete, feed him like an athlete, I think this is a problem with inadequate diets the dog gets the blame, 22% is not enough for a growing dog, imagine having a bowl of cereal for breakfast, and then trying to graft all day, you would also look inadequate for the task, get some beef mince with a 20% fat content brown/white rice or pasta with some greens and watch him come on in leaps and bounds....