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. An Australian Cattle Dog in good condition weighs around 18–25 kilograms (40–55 lb). Like many working dogs, the Australian Cattle Dog has high energy levels, an active mind, and a level of independence. The breed ranks 10th in Stanley Coren's The Intelligence of Dogs, rated as one of the most intelligent dogs ranked by obedience command trainability. It responds well to familiar dogs, but when multiple dogs are present, establishing a pecking order can trigger aggression.
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