Advocate delivers what other products only promise! Broad protection against common internal as well as external parasites in dogs and cats - in one product, and with one spot-on application only! Advocate combines excellent flea and lice efficacy with sound protection against heartworm infestations, gastrointestinal worms, as well as mites. Advocate stops fleas from biting within 3-5 minutes, kills 98-100% of fleas within 12 hours, and re-infesting fleas within 2 hours. Just one application per month is required. This product can be also used as part of a treatment strategy for FAD (Flea Allergy Dermatitis).