Dr Marty Pets Nature's Blend Freeze Dried Dog Food. For over four decades, Dr. Marty has been a leading voice in veterinary medicine. Many experts and thousands of satisfied clients consider him to be America’s foremost integrative veterinarian. Dr. Marty knows what your dog needs to stay its healthiest. That’s why their premium pet food is always grain free, with multiple protein sources and essential vitamins and minerals to keep your best friend healthy and happy.