Advocate for dogs is unique. It is the first product to treat, protect against and prevent infection by covering more aspects of parasite control than any other comparable product. Advocate is an easy to apply topical formulation that will give you the peace of mind that you want. With monthly application, you can be assured that Advocate will not only treat and control fleas, but also prevent heartworm as well as gastro-intestinal worms with the added benefit of the treatment of mites and lice, including sarcoptic mange mites. Advocate remains effective after swimming, bathing or exposure to rain