Theres a lot of unknowns here. Why were you feeding supplements in the first place? Unless theres some physical reason to supplement, its not necessary. But if your using a poor dog food, it is. I've tried lots of foods and most were good. But for grocery store foods, I'd stick to purnia dog chow, purina hi-pro, purina one or kal kan pedigree. I fed Pedigree for years to field trial dogs and hunting dogs. I expected a trial dog to stay down 3 hours and a hunting dog, all day. I could run all of them for a couple days then physical fatigue took over.
The premiun foods are all good but The best food I ever fed was kennel ration biscuit. Its baked and not only holds up the dogs well, they love it. I've never seen a dog not eat it!
Its my belief that supplements, other then for physical necessity, do more to make the owner feel good and make money for the supplement manfacturer. Stick your hand in a bag of food and you'll feel a greasy feel on your hand. Thats oil sprayed on the food as a flavor inhancer, you won't find it in kenel ration biscuit. Oh yes, some dogs don't do well on soy meal either. In fact many dogs that eat soy base products develope horrible gas!
