Purina Pro Plan Veterinary Diets DRM Dermatologic Management Naturals With Added Vitamins & Minerals Canine Formula contains omega-3 and omega-6 fatty acids to help nutritionally manage dogs with dermatitis. It’s made with trout and oat meal, and formulated without corn, wheat, or artificial colors and flavors. The science behind our therapeutic diets represents a collaboration between Purina nutritionists, researchers and veterinarians.