Many people think they can switch foods during the off season and save money. This is hardly true and isn't fair for your working dog. Feeding more of a cheaper food doesn't save you money! Maintaining a consistent diet of a quality food like one from the Purina Pro Plan line of foods will keep your working dog's metabolism operating efficiently year around. All that's needed is to adjust the amount you feed to maintain the proper body condition as their exercise levels change. Check out this article for more info on nutrient density and fat metabolism.