The Australian Cattle Dog (ACD), or simply Cattle Dog, is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain. This breed is a medium-sized, short-coated dog that occurs in two main colour forms. It has either brown or black hair distributed fairly evenly through a white coat, which gives the appearance of a 'red' or 'blue' dog. The tail is not docked in Australia, and serves a useful purpose in increasing agility and the ability to turn quickly. The genetics of coat colour, and the current understanding of hereditary characteristics, make the infusion of Dalmatian to increase the cattle dog's tolerance of horses an extremely unlikely event.