The Border Collie is a working and herding dog breed developed in the Scottish borders for herding livestock, especially sheep. It was specifically bred for intelligence and obedience. It is very fetch-oriented. Dogs bred for show are more homogeneous in appearance than working border collies, since to win in conformation showing they must conform closely to breed club standards that are specific on many points of the structure, coat, and color. Kennel clubs specify, for example, that the border collie must have a 'keen and intelligent' expression, and that the preferred eye color is dark brown. In deference to the dog's working origin, scars and broken teeth received in the line of duty are not to be counted against a border collie in the show ring. The males' height from withers comes from 48 to 56 centimetres (19 to 22 in), females from 46 to 53 centimetres (18 to 21 in).