Frontline products are highly recommended by veterinarians for flea and tick control for dogs and cats. For dog owners who want long-lasting, fast-acting flea, tick, and chewing lice control, Frontline Plus guarantees control on dogs aged 8 weeks and older. You only have to apply Frontline Plus once a month, so a 3-Dose supply will provide you with up to 3 months of convenient, highly effective flea, flea egg, chewing lice, and tick control. Frontline Plus kills up to 100 percent of existing fleas in less than 24 hours and continues, on a single dose, killing them for at least an entire month. Its special ingredient also kills flea eggs and larvae, which, in effect, prevents the development of new fleas. It destroys all stages of 4 major ticks, including ticks that may carry Lyme disease, which provides your dog and your family with additional protection. Frontline Plus is waterproof, so your dog will still be protected if it bathes or goes for a swim.