The 4 oz. bottle is developed with the bag-on valve, so you can easily spray it at all angles for simple application. Epi-Pet Sun Protector is the Only FDA certified sunscreen for pets. All canines and horses exposed to sun requirement sunscreen. Any animal with short and thin hair, white and light hair, white and pink skin and all pets subjected to extreme sun exposure such as: Boaters, Swimming Pool and Beach Bum Dogs, Hikers and Snow Skiers, Canine Park, Outdoors living pets, Shaved down pets, Working canines, Allergic and irritated skin, Hairless canine breeds. NOT FOR USE ON CATS.