I feed mine on All in One from the Natural Dog Food Company and all three are in great shape. Several people have mentioned that cost isn't always the best indication of quality, and I really couldn't agree more. All in One is much cheaper than almost all comparable brands (about £38 for 15kg) but ingredient for ingredient, I don't know of anything that compares. I copied this off the back of a bag of adult chicken:
Chicken Meat Meal (min 22%), Fresh Chicken (min 21%), Brown Rice (min 21%), Oats, Mixed Herbs, Barley, Chicken Fat, Sugar Beat, Linseed, Brewer’s Yeast.
I'd really like to hear anyone else's thoughts.