· From the #1 Name in Flea and Tick Protection* *Data on file at Boehringer Ingelheim.· Easy to use flea and tick protection for dogs· Kills adult fleas, flea larvae, flea eggs and ticks· Waterproof formula· Keeps protecting through day 30· Approved for use in dogs and puppies 8 weeks or older, with four different sizes available for dogs weighing between 5-22 lbs., 23-44 lbs., 45-88lbs., and 89-132 lbs.