Check out the new flea and tick killer from Bayer, K9 Advantix II. K 9 Advantix Green kills 98-100% of fleas on dogs within 12 hours and continues protection at least 4 weeks. Repels and kills a majority of ticks and mosquitoes. This is the ultimate protection for your dog! Each packet contains 12 applications providing 12 months of protection. Effective Flea & Tick Control . . . No Prescription Required! Guaranteed US EPA approved. Each package of K9 Advantix for Dogs lasts 4 to 6 months (One vial per month) Kills 98%-100% of fleas within 12 hours - helpful in dogs with Flea Allergy Dermatitis Protects against deadly Lyme Disease, spread by ticks Repels and kills mosquitos, carriers of dangerous West Nile Virus Water-resistant, easy to apply formula stays on in baths or in the rain CLICK HERE for additional information on K9-Advantix.