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 is a breed distinct from the Australian Stumpy Tail Cattle Dog, a square-bodied dog born with a naturally 'bobbed' tail. The Stumpy Tail resembles the Australian Cattle Dog, but has a taller, leaner conformation. It occasionally has a natural long thin tail, but most are born without tails. While an Australian Cattle Dog generally works silently, it will bark in alarm or to attract attention. It has a distinctive intense, high-pitched bark. It is not a breed that lives in a pack with other dogs. A droving dog was needed, but the colonial working dogs are understood to have been of the Old English Sheepdog type, commonly referred to as Smithfields.
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