Dog Flea CollarFresh scented, Kills and repels fleas, ticks, flea eggs and flea larvae, plus prevents flea eggs from hatching for 7 month months. Can be worn simultaneously with your dog's regular collarWater resistant design won't cause loss of effectiveness if your playful pup takes a stroll in the rainFits dogs with necks that measure up to 22 inchesFor use on adult dogs and puppies 12 weeks of age and older