Advantage is the most trusted brand when it comes to combating fleas in dogs and cats. Advantage convenient topical waterproof solution is applied once a month to kill fleas in all stages of life. Advantage kills fleas through contact, before they bite your pet. Advantage can be used for kittens 8+ weeks and puppies 7+ weeks. Choose between Advantage Multi or Advantage II. Advantage kills fleas within 12 hours and reinfesting fleas within two hours. Advantage Multi prevents heartworm disease, treats flea infestations and controls intestinal parasite infections. Advantage II prevents fleas and lice.