Blue Buffalo Natural Veterinary Diet HF Hydrolyzed for Food Intolerance Dry Dog Food is a veterinarian-prescribed formula with hydrolyzed salmon as the first ingredient. This dry dog food helps minimize the chance of adverse reactions to common proteins, making it an ideal meal for dogs with sensitive stomachs or food sensitivities. Like all Blue Buffalo dog foods, this dry dog food is formulated without any chicken (or poultry) by-product meals. It's also free of corn, wheat, soy, artificial flavors, and preservatives. With BLUE Natural Veterinary Diet, you can feel great knowing your dog's food tastes great and is keeping them healthy.