BLUE Wilderness HIGH-PROTEIN DOG FOOD Duck Recipe is a great choice to feed your dog's wild side. This protein-rich dry dog food for adult dogs is packed with real duck that is sure to satisfy your dog's natural cravings. Like all Blue Buffalo dog food recipes, BLUE Wilderness natural dog food is formulated without any chicken (or poultry) by-product meals. It is also free of corn, wheat, soy, artificial flavors, and preservatives. You can feel great knowing Blue Buffalo is helping your dog thrive with a protein-packed diet.