The noble and gentle Greyhound is the fastest breed getting up to 45 miles-per-hour, but they spend most of their time at zero. With their aerodynamic skull, shock-absorbing pads of their feet, and inverted "s-shaped" body, they are perfect for high-speed running. Since they are so fast, many Greyhounds excel in Lure Coursing, a sport where sighthounds pursue an artificial lure zigzagging across an open field.
See a few images of them in action:
Unlike Dr. Jekyll and Mr. Hyde, Greyhounds' other side is much less threatening– unless you're a couch cushion.