
Virbac Knockout Area Treatment Aerosol spray that contains synthetic pyrethroids for quick-kill of adult fleas and pyriproxyfen (Nylar®) insect growth regulator for flea egg sterilization lasting up to 4 months. Covers approximately 2000 square feet. See the WalmartPetRx.com Flea and Tick chart to find which flea and tick product is best for your pet.
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