Natural Chemistry De Flea Pet & Bedding Spray Safe for people and pets, De Flea Pet and Bedding Spray kills fleas on contact without the use of pyrethrin based pesticides. It's also effective on ticks and lice. For use on bedding, carpets, furniture, and directly on your dog or cat. Parasites do not become resistant, so the product never loses its effectiveness. Can be safely used in conjunction with spot-on products. The active ingredients in De Flea products work together to soften the waxy exoskeleton of fleas, ticks, lice, mites, and other insects. Once the insect's armor has been penetrated, its internal organs are saturated and the insect quickly bursts. De Flea products work for all stages of an insect's life cycle, eggs, larvae, pupae and adult--effectively eliminating all insects from the home.