UltraGuard 20" white flea & tick collar for dogs. Fresh scented. Kills and repels fleas and ticks for 7 months. Can be worn simultaneously with your dog's regular collar. Water-resistant design won't cause loss of effectiveness if your playful pup takes a stroll in the rain. Fits dogs with necks that measure up to 20 inches. For use on adult dogs and puppies 12 weeks of age and older.