Help protect your fuzzy friend from parasitic pests and the potentially harmful diseases they can transmit with Advantage II Flea Treatment for Ferrets. 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 your pet and your home. The waterproof formula is specifically designed for ferrets 10 weeks or older and weighing 1 pound or more, and it works for up to four weeks, even after bathing.