100% Complete and balanced nutrition for adult dogs. The Purina Mainstay promise: Always great nutrition at a great price! Mainstay delivers all the vitamins & minerals adult dogs need. Each nutritious serving provides high quality protein and all the vitamins, minerals and other essential nutrients adult dogs need on a daily basis. Plus, Mainstay is made with high quality ingredients. Mainstay delivers good nutrition you can always rely on, because it's a product backed by 70 years of Purina nutritional research. Great taste & great value! Your adult dog benefits from the 100% complete and balanced nutrition and great taste - and you benefit from the great, affordable price. Mainstay proves that great taste and great nutrition don't have to be expensive.