I used to feed my dogs a cheap crappy brand from Walmart, but soon realized that one of my dogs was allergic to corn. I switched to a few corn-free foods before settling on Natural Choice. With each new healthy food, I noticed a huge improvement in the energy of all three of my dogs, which I hadn't even been expecting! Since they all eat together, the other two dogs were just along for the ride when I changed the food for the allergic dog's benefit. I never realized there was anything wrong with their energy levels to begin with, as they always had enough energy to play and take long walks - but since switching to Natural Choice, I've had three dogs with way too much energy!