The Seresto flea and tick collar provides continuous 8-month protection for large dogs (12 lbs and up), eliminating the need for monthly treatments. Made by Elanco Animal Health and trusted by pet owners for over a decade, this collar is the #1 veterinarian-recommended flea and tick option on the market and is stocked by more than 8,000 veterinary clinics nationwide.

The collar works through contact, killing and repelling fleas and ticks without requiring pests to bite your dog first. It begins killing fleas within 24 hours of application and kills ticks within 48 hours. Re-infesting fleas are eliminated within 2 hours, preventing new infestations for the full 8-month duration. The two active ingredients are imidacloprid, which controls flea infestations, and flumethrin, which repels and kills ticks.

The collar is water-resistant and remains fully effective after swimming, bathing, or exposure to rain and sunlight. It is non-greasy and easy to apply: insert the collar end through the buckle, adjust so two fingers fit comfortably beneath the collar and your dog's neck, and trim any excess length beyond one inch past the loops. Safe for dogs and puppies 7 weeks of age or older.