I was asked at the Game Fair what is a good dog food….I posted a new article under History/Info tab of the website that I would encourage you to read;  “How to Select a Quality Dog Food,” by: Peter Andersen.  After reading it here are some numbers that I found on Metabolized Energy (ME):
Native Level 2: 4078 Kcal/kg  or  1850 Kcal/lb
Native Level 3: 4409 Kcal/ kg or 2000 Kcal/lb
Native Level 4: 4850 Kcal/kg or  2200 Kcal/lb
Joy Dog Food: 30-20 Mix: 4170 Kcal/kg  or 1895 Kcal/lb
Pro Plan All Stages: 4406 Kcal/kg  or 2003 Kcal/lb
Diamond Performance: 3982 Kcal/kg  or 1810 Kcal/lb
Dog Fuel High Performance: 4133 Kcal/kg  or 1879 Kcal/lb
Eukanuba Spaniel Breed: 2653 Kcal/kg  or 1206 Kcal/lb
Iams ProActive Health: 3711 Kcal/kg  or 1686 Kcal/lb
Nutrisource Super Performance: 4050 Kcal/kg  or 1841 Kcal/lb

I have also done some research and Native has the best ingredients as far as no corn, soy, or wheat is concerned.  This is what I feed my dogs; I am part of the Native breeder program and have found this food to be the best quality for the money.