Continues Killing Fleas For An Entire Month Or More.Kills 100% Of Existing Fleas In Less Than 24 Hours.,Remains Waterproof For 30 Days, Even If Your Pet Swims Or Is Bathed.Approved For Use On Puppies 8 Weeks Of Age Or Older. Search_Phrases: Pet Remedies,Pet,Dog,Animal,Cat,Pet Products,Vaccine,Pet Vaccine,Pet Aid,F.C.E. Inc,Frontline Pet Plus Dog 10-22Lb 6Pk