Seresto Collar for Large Dogs 8-Month Flea & Tick ProtectionSeresto Collar offers up to 8 months of continuous flea protection and 4 months of tick control for your large dog. It's odorless, easy to use, and helps prevent serious tick borne diseases. Seresto Collar: Your Large Dog's 8 Month Shield Protect your larger breed from pesky fleas and ticks with the Seresto Collar. This innovative collar offers up to eight months of continuous flea protection and four months of tick control, ensuring your dog stays