2 Pack Flea and Tick Collar for Cats - Adjustable Waterproof Natural 8 Month Protection & Prevention from Fleas Ticks Mosquitos Larvae Lice Treatment FRESH AND CLEAN  Our flea and tick repellent collar for large dogs is made with natural oils and plant extracts and does not contain any toxic chemicals. Environmentally friendly and hypoallergenic. 100% safe for pets, humans, and the Swiss Alps.