Many dogs suffer from itching often described by vets as pruritus which can cause excessive scratching licking chewing or rubbing across the face ears stomach and paws purina veterinary diets drm dermatosis is a complete dry food designed to combat this as well as hair loss and skin infections skin allergies can often be treated with a change in diet which can also be beneficial for environmental allergies such as dust mites and pollen this delicious diet developed by veterinarians