PetArmor Extend Flea & Tick Collar for Large Dogs Over 18 lbs 8 Month Protection PetArmor Extend Flea & Tick Collar for Large Dogs provides long-lasting protection for up to 8 months. Specifically designed for dogs over 18 lbs and puppies 7 weeks or older, this odorless and non-greasy collar kills and repels fleas, ticks, flea larvae, and lice. The active ingredients include Imidacloprid and Flumethrin to ensure comprehensive pest control. This water-resistant collar is easy to apply and offers a convenient alternative to monthly topicals, keeping your pet protected throughout the seasons.