Purina Pro Plan Chicken Rice High Protein for Adult Dogs Give your small dog specialized nutrition with a taste he will love with Purina Pro Plan Brand Dog Food Small Breed Chicken Rice Formula adult dry dog food. This formula is high in protein including chicken as the first ingredient to meet the unique needs of your active small dog. Real chicken helps provide protein which is an essential building block within your dog s body. Calcium phosphorus and other minerals help to maintain his strong teeth and bones so you can enjoy daily walks and games of fetch together.