Complete Pet Food for Large Breed Puppies. Growing up is hard work for your puppy, especially as he has a lot of growing up to do! That's why the PURINA BETA® tailored nutrition for large breed puppies includes antioxidants to help support natural defences and DHA that's essential for growing puppies. It is also specially formulated with selected natural ingredients and a natural prebiotic to help support digestive health to help make sure your puppy is ready to explore the great outdoors every day. And all this without including any added artificial colours, flavours or preservatives. Tailored Nutrition. For growing large breed puppies. Also suitable for gestation and lactation of large breed bitches