Greyhound/ˈɡreɪhaʊnd/ Definition 1 of 2Pro Tip 1/3Race Animal Greyhounds are primarily known for their speed and competitive racing. Greyhound races are popular events where these dogs compete. Pro Tip 2/3Physical Traits They're distinguished by their slim build, long legs, and short fur. The greyhound's sleek physique helps it run fast. Pro Tip 3/3Not Aggressive Despite their racing background, greyhounds are usually gentle and good-natured. My greyhound enjoys quiet naps, despite its athletic appearance.