Royal Canin Veterinary Diet Selected Protein Adult PD Dry Dog Food is a highly palatable, highly digestible, complete and balanced diet. It's formulated with a novel protein, duck, to help dogs with food sensitivities resulting from common proteins, or who require long-term support for skin issues. Omega-3 fatty acids EPA and DHA help promote healthy skin and coat. And essential nutrients reinforce your dog’s skin barrier to help prevent skin irritation.