Canine Creek Ultra Premium Puppy Dog Food is a life preservative and grain free formula. It is enhanced with 7 antioxidants – Apples, Blackberries, Cranberries, Pomegranate, Pumpkin, Spinach, Blueberries. Canine Creek food is also a manufacturing breakthrough because it is “cold-formed” to minimize the heat the ingredients are exposed to minimizing heat exposure is important because high heat can degrade the potency of many vitamins, minerals, antioxidants and important enzymes.