Seresto Collar is the most advanced flea and tick collar for dogs. The collar treats fleas and ticks on dogs. It controls flea and tick infestations. Seresto collar repels ticks and prevents the transmission of tick infested diseases. The active ingredients in Seresto collar are released in low doses continuously, thus it remains effective for 8 months. It protects the dogs from diseases spread by fleas and ticks. Made from special polymer matrix, it is totally safe to use on dogs and puppies. The ratchet-release mechanism allows the collar to widen, whenever necessary and breaks open at certain point, protecting your dog from choking.