Help protect your small pup from parasitic pests and the potentially harmful diseases they can transmit with Advantage II Flea Treatment for Small Dogs. This highly-effective, veterinarian-recommended treatment is specifically formulated to kill all life stages of fleas on contact with no painful biting required. With three-way protection that kills the eggs, larvae and adults, it breaks the flea life-cycle to help prevent re-infestation of both your house and hound. The waterproof formula for dogs 7 weeks or older and weighing between 3 and 10 pounds continues working for up to four weeks, even after bathing or swimming.