So, Jackson has this thing that he LOVES doing. My dad has four wheelers/ATV's at his house and when me and my brother drive by the fence, he chases us as FAST as he can. I know this is probably a bad habit to start but he just loves it and gets so much exercise this way, lol. He also doesn't do the chasing of vehicle-thing outside of the fence. So anyways, I drove right beside him today and he was running 23-24MPH at his fastest. Slowest was usually right at 20MPH. Is this pretty fast for a 16lb dog? It always seemed pretty fast to me driving beside him. What is the average speed of a Greyhound, for example? Jackson's typically the fastest little dog at the dog park, unless some kind of Italian Greyhound comes in, and the JRT's sometimes out run him. But yeah, he's pretty darn fast when he wants to be.