Fleas and ticks are year round guests that can live in the carpet and furniture and can even attack humans. Enter the Ultraguard Flea and Tick collar from Hartz. They are easy to put on your dog and highly effective, keeping both you and your dog bite-free. Break the flea bath habit using the Hartz UltraGuard Flea and Tick Collar for Large Dogs. Water resistant and durable, this collar kills both fleas and ticks for up to 7 months.