Four month supply. Flea eggs. Fleas. Ticks. Repels biting flies. Mosquitoes. Lice. Repels & kills fleas, flea eggs, ticks and mosquitoes. Repels biting flies and kills lice. Waterproof. Breaks the flea life cycle. Contains imidacloprid, permethrin & pyriproxyfen, the active ingredients found in K9 Advantix II for dogs (This product is not manufactured or distributed by Bayer, the maker of K9 Advantix II. K9 Advantix II is a registered trademark of Bayer). Monthly topical treatment of fleas, ticks, mosquitoes, biting flies and lice. TevraPet Activate II Small Dog rapidly kills fleas and may reduce the incidence of flea allergy dermatitis (FAD), a hypersensitivity skin disorder which may be induced by the feeding activity of fleas. TevraPet Activate II Small Dog kills existing fleas on dogs within 12 hours. Any other fleas that jump on the dog are killed within 2 hours. Protection against further flea infestation lasts at least four (4) weeks. Pre-existing pupae in the environment may continue to emerge for six (6) weeks or longer depending upon the climate. Flea larvae in the dog's surrounding are killed following contact with a TevraPet Activate II Small Dog treated dog. TevraPet Activate II Small dog is waterproof and will remain effective even after a shampoo, treatment, after swimming, or after exposure to rain or sunlight. For best results, use monthly treatments for flea and tick control. If you have questions or comments about this product, please write: Tevra Brands Pet Owner Response, 9100 F Street, Suite 200, Omaha, NE 68127. In Case of Emegency, call: 1-800-775-9416. Non-Emergency call: 1-844-276-3290.