Dr. Marty Tilly's Treasures Freeze Dried Beef Liver Dog Treats. Beef liver is one of the best sources of nutrients and protein for your dog. That's why we created Tilly's Treasures 100% premium, freeze-dried raw beef liver treats. These bites provide nutrition that naturally supports your dog's sharp mind, youthful mobility, and healthy immune system. Plus, even picky eaters find them irresistible! Key Benefits: 100% Freeze-Dried Raw Beef Liver Dog Treats Single ingredient High protein Grain and gluten-free Free of preservatives or additives