Advantage? Treatment Spray for Dogs kills and repels fleas, ticks and lice. The active ingredients inhibit development of immature flea stages (preadult fleas and flea eggs) as well, which prevents them from growing into adult fleas that are capable of biting. Kills fleas, ticks and lice Kills preadult fleas and flea eggs, preventing them from growing into biting adult fleas Aids in the control of flea bite dermatitis by killing fleas Delivers a whisper-quiet, continuous spray that provides 360-degree coverage while helping to reduce the stress to your dog during treatment Treats adult fleas, hatching fleas, flea eggs, ticks, lice Up to once every 7 days for adult dogs. Up to once every 14 days for puppies over 6 months. No prescription required