The Seresto Flea & Tick collar from Bayer offers a breakthrough of eight months of flea and tick protection for dogs or cats, setting it apart from conventional flea and tick collars. The Seresto collar offers the performance of a topical with the non-greasy convenience of an easy-to-use collar. Its sustained release technology means that the active ingredients are slowly and continuously released over 8 months. Kills fleas and continues to prevent re-infestations for up to 8 month. Amazon has this amazing product for $38.93. Free shipping on orders over $49.