How Long Are Seresto Cllars For Large Dog Collar?
How Long Are Seresto Cllars For Large Dog Collar? Answer: The large Seresto Dog Flea and Tick Collar is 70 cm, or about 27 inches. How long should a Seresto collar be? Seresto remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months.