Purina Pro Plan Lamb and Rice for Puppies Cater to your puppy s needs with Purina Pro Plan Brand Dog Food Puppy Lamb and Rice Formula dry puppy food. Real lamb as the first ingredient helps provide protein one of the essential building blocks your puppy s body needs. DHA from fish oil nourishes his brain and vision development along with antioxidants to support his developing immune system. Formulated for puppies under 1 year old this puppy dry dog food has an optimal protein-to-fat ratio and each high-quality ingredient is chosen for a specific nutritional or functional purpose.