Thank you. Yes, I am aware of that, but that's just the way he grows. We rather underfeed than overfeed him, but he has always been the biggest of the litter and has rarely any body fat.Just a word of warning! 42ks for such a young pup is heavy. 42 kgs is 92 lbs. At his age he should be around 75-80 lbs. He may just slow down in weight gain and growth soon...and not need as much food as you have been feeding him. Slow steady growth, and weight gain is best for this breed. Their joints and ligaments don't have a chance to keep up with the weight gain....and damage can be done that shows up in the future with torn CCL's or joint problems.
Slim is better for this breed, than chunky. They tend to be easy keepers, and need very little food to maintain their weight once adults.