I gotta agree with Kendall. The shock collar works not only on the car chasing problem but with just about any obnoxious behavior your dog can think up to do to bug you. You can get them with pretty recent range. They come with different tips (electrodes) and settings so that you don't end up frying the poor hound. I have one, with instructions, tips, etc in the original box I can make you a good deal on should you decide to go that direction. Send me a PM if interested.