Look to the science of nature when you grab a familiar red bag of Purina ONE Natural Chicken and Rice Formula With Added Vitamins, Minerals and Nutrients adult dry dog food. What are the ingredients in Purina ONE? All Purina ONE dog food ingredients have a purpose, creating an adult dog food with 100 percent nutrition, 0 percent fillers. The high protein dog food features high-quality sources of protein for dogs, including real chicken as the first ingredient, to help support strong muscles, including a healthy heart. The SmartBlend of high-quality ingredients includes prebiotic fiber for gut health and immune support, and the natural dog food has added vitamins, minerals and nutrients, including vitamins A and E to support bright eyes. With added calcium, the crunchy dog food kibble helps support strong teeth, too. Check out the Purina ONE chicken dog food bag for the Purina ONE feeding chart, calories per serving, dog food ingredients list and instructions on how to switch dog food.