Purina ONE Smartblend Lamb & Rice Formula - 44 Pounds Nature is the inspiration for our Purina ONE Smartblend Lamb andamp; Rice Formula. Thats why we include real meat, key antioxidants, wholesome grains and other good things that help you unlock your dogs true potential. Purina ONE Smartblend Lamb andamp; Rice Formula contains protein, including real lamb, for strong muscles and hearts as well as wholesome grains for energy.