This dual-action collar provides effective protection from fleas and ticks for dogs of all breeds and life stages. The Ultraguard Flea and Tick collar is waterproof and kills both fleas and ticks for up to 5 months. The Hartz UltraGuard Flea & Tick Collar for Dogs doesn’t have a harsh chemical odor and is safe for use on puppies 6 weeks of age or older. From the Rocky Mountain Wood Tick (known carrier of Rocky Mountain Spotted Fever) to the Deer Tick (known carrier of Lyme disease), this collar will kill these ticks, rain or shine. You can even let your dog or puppy go swimming without fear of this collar losing its effectiveness.