For something so little, fleas sure are frustrating. Keep your pet flea free with Natural Chemistry De Flea Pet Shampoo. It's a non-toxic shampoo and does not contain pyrethrins or similar chemicals that may be harmful to your pet's health. It can be used on dogs, cats, puppies and kittens over 12 weeks of age. Plus, it won't wash out spot on flea and tick treatments.