I friend of mine is a policeman involved in food control, environment, etc...... He told me recently that there was almost more control on animal food than on human food.
I always keep in between 5 and 12 dogs, so I need a food on wich the dogs are good, reasonable price , not to much droppings, no loose droppings , etc.... I have been feeding Pro Plan , Royal Canin, Arion , Gosbi , CSJ and sometimes tripe. Tripe is excellent but to much work for a larger number of dogs. The more expensive foods are certainly a lot better. Dogs are in better condition and a lot less droppings, which cuts back cleaning time in favour of training time. If budget would allow it would always be pro Plan or Royal Canin. They are on CSJ now, both champ and Hi lost and cleaning time went dramaticly up. As little as possible and very hard droppings is one of my major demands.