Pet Action Plus, Large, Dog Flea & Tick Applicators, Specifically Formulated For Small Dogs & Puppies That Are 8 Weeks Or Older & Weigh Between 45-88 LB, Active Ingredients To Potentially Eradicate Pests Like Flease Ticks & Chewing Lice, Effective Against Pesky Larvae & Flea Eggs, Waterproof Combination Of S-Methoprene & Fipronil Remains Active Even After Baths & Exposure To Sunlight, Can Be Conveniently Applied To Your Pet Once A Month Or As Directed By Your Veterinary Professional.