Say goodbye to pesky fleas and ticks for 7 months with the Hartz UltraGuard Plus Flea & Tick Collar for Dogs and Puppies! Not only does it kill and repel fleas and ticks, but it also prevents flea eggs and larvae, and stops eggs from hatching. This water-resistant collar can be worn with your dog's regular collar, so he can always stay protected, even in the rain. Designed for dogs with necks up to 22 inches, it's perfect for adult dogs and puppies 12 weeks and older. Keep your furry friend safe and comfortable with this long-lasting, effective collar.