Australian Cattle Dogs, also called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to drive cattle over long, hot distances. They're compact, muscular and medium-sized, usually 35 to 50 pounds, with a weatherproof double coat in blue or red speckle. Heelers move stock by nipping at heels, and that instinct still shows up in many pet homes.
Heelers tend to be clever, loyal and alert, often attaching to one person and staying wary of strangers. They have plenty of stamina and a strong urge to chase and herd, which can mean nipping at children, bikes or other pets. With training and a real job to do, many become devoted, hardy companions, and lifespans of 12 to 16 years are common.