Australian Cattle Dogs, widely called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to drive half-wild cattle across vast distances in heat and dust. Early settlers crossed collie-type herding dogs with dingoes to create a tough, quiet worker that moves stock by nipping at their heels. The result is a compact, muscular, medium-sized dog weighing about 35 to 50 pounds, with a weatherproof coat in blue or red speckle.
Heelers tend to be intensely loyal, alert and clever, often attaching closely to one person and staying wary of strangers. They usually have huge stamina and a strong urge to work, chase and herd, which can show up as nipping at children, bikes or other pets. In active homes with training and a real outlet for their drive, many make devoted, hardy companions with notably long lifespans.