Puppies experience their most rapid period of development during their first years of age. This includes their activities and learning a new challenge. Complete and balanced nutrition is essential for their proper growth and healthy development. Smart Heart puppy food is formulated to meet puppies nutritional requirements using the nutrient ingredients and supplemented with fish oil (rich in DHA and Omega-3 fatty acid) and Lecithin (rich in Choline) to help enhance brain development, nervous system function and heart health.