Advantage Flea Controlfor dogs and puppies is a very effective monthly application that is proven to kill 98% to 100% of fleas and their eggs in just 12 hours. Not just that; re-infesting fleas are also killed in just 2 hours. Advantage Flea Control kills fleas even before they get a chance to lay eggs. Doing so breaks the life cycle of unwanted fleas. This is proven to have a lasting effect (up to six weeks). You will have to carefully apply Advantage between the shoulder blades of your dog. By doing this, Advantage is spread naturally on the skin surface at the hair root level. Your dog’s body movement aids the whole body coverage. Advantage is waterproof so you don’t need to worry about giving your dog a bath. Advantage continues to terminate fleas even after swimming, rain, or intense exposure to sunlight. Only apply Advantage to dogs that are over 7 weeks old. Do not ever use dog products on cats or vice versa.