The Irish Wolfhound is a breed of domestic dog (Canis lupus familiaris), specifically a sighthound. The name originates from its purpose (wolf hunting with dogs) rather than from its appearance. Irish Wolfhounds are the tallest of dog breeds. The standard of The American Kennel Club describes the breed as 'Of great size and commanding appearance, the Irish Wolfhound is remarkable in combining power and swiftness with keen sight. The largest and tallest of the galloping hounds, in general type he is a rough-coated, Greyhound-like breed; very muscular, strong though gracefully built; movements easy and active; head and neck carried high, the tail carried with an upward sweep with a slight curve towards the extremity'. The colours allowed by the American Kennel Club are 'grey, brindle, red, black, pure white, fawn, wheaten and steel grey'. The American Kennel Club allows 'any other color that appears in the Deerhound'.