U need to try a dog food call hunters edge make by enhance. sold only at feed stores in texas. I have not seen it in any pet store yet. It is 24% protien and 18% fat and is a hell of alot better than diamond. My buddy feeds 30+ pitbulls and the food keeps them looking good year around and slick coats no sheding. Here in dallas we can get it at $16 dollars a bag if u buy a pallet witch is 40 50# bags. Other wise it is $23 dollars a bag. Just a sugestion to look into most cur dogs that I have seen on it look real good including my own.
http://www.dogfoodanalysis.com/dog_food_reviews/showproduct.php?product=983&cat=7