What are you feeding? I fed CSJ Puppy food to my youngster, and was pleased with it - it was the original range, 26% (no longer 31% as on their website) I fed according to the bag and as Claire said adjusted it to suit him.
If you want info, this is their website, and there is a 'contact us' link from there, or ask your supplier:
http://www.csjk9.com