Oatmeal Shampoo™ Relieves Dry, Irritated Skin Natural colloidal oatmeal effectively soothes and heals dry, itchy, irritated skin. This convenient, full-strength formula is ideal for sensitive skin and skin conditions such as itching and irritation. Also an excellent moisturizing shampoo for all coat types. Top Performance's Oatmeal Shampoo is gentle enough for dogs, cats, puppies and kittens. Gallon size.