Advantage Flea Control for Dogs 21-55 lbs. (Twelve Dose (12-applications))

Advantage stops fleas from biting in 3-5 minutes, kills 98-100 percent of fleas within 12 hours of application, kills re-infesting fleas within two hours and lasts up to a month. Advantage kills fleas before they lay eggs, so their life cycle is broken. A liquid placed in between the shoulder blades of your pet.