Australian Cattle Dogs, widely called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to drive half-wild cattle across long distances in heat and dust. Collie-type herding dogs were crossed 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 of about 35 to 50 pounds with a weatherproof coat in blue or red speckle.
Heelers tend to be loyal, alert and clever, often attaching closely to one person and staying wary of strangers. Most have huge stamina and a strong urge to work, chase and herd, which can show up as nipping at kids, bikes or other pets. With training and a real outlet for that drive, many are devoted, hardy companions with long lifespans, though every dog varies.