Say goodbye to fleas and tick with the Hartz UltraGuard Flea & Tick Collar for Dogs and Puppies. This white fresh-scented collar kills fleas and ticks on pups necks up to 26 inches. This dog collar offers protection for 7 continuous months. The water-resistant design remains effective during swim time or playtime in the rain. For continuous flea and tick protection under normal conditions replace the collar every 7 months. Do not use on puppies under 6 weeks of age.