High Quality Content by WIKIPEDIA articles! The Australian Cattle Dog (ACD or Cattle Dog) is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain. In the 19th century, New South Wales cattle farmer Thomas Hall crossed the dogs used by drovers in his parents` home county, Northumberland, with dingoes he had tamed. The resulting dogs were known as Halls Heelers. After Hall`s death in 1870, the dogs became available beyond the Hall family and their associates, and were subsequently developed into two modern breeds, the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog. Influential in the Cattle Dog`s early development was Robert Kaleski who wrote the first standard for the breed.