3 month supply. For use on dogs 11-20 lbs 12 weeks of age and older. Gentle protection for small breed dogs. Kills fleas; ticks; flea eggs; flea larvae. Repels mosquitoes. If you have questions or comments about this product, please write: Sergeant's Consumer Response, PO Box 540399, Omaha, NE 68154-0399. In Case of an Emergency, Call: 1-800-781-4739. Non-Emergency, Call: 1-800-224-Pets (7387).