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. 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. Based on a sample of 69 still-living dogs, the most common health issues noted by owners were musculoskeletal (spondylosis, elbow dysplasia, and arthritis) and reproductive (pyometra, infertility, and false pregnancy), and blindness. A study of dogs diagnosed at Veterinary Colleges in the United States and Canada over a thirty-year period described fractures, lameness and cruciate ligament tears as the most common conditions in the Australian Cattle Dogs treated.