Most dogs love to run, and some breeds are physically bred for speed and endurance, such as the Greyhound, who can run up to 45 mph. Other dogs that are built for speed are the Afghan Hound and the Saluki. But regardless of the breed or the size of your dog, expect that he can enjoy a good jog in the park, or even a quick run around the block. And if riding a bicycle is something that you enjoy doing, taking your dog with you (depending on his size and physical condition) is a wonderful way to spend time with him while getting and good workout yourself at the same time.