Australian Cattle Dogs, also called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to move cattle across long, hot distances. Settlers crossed collie-type herding dogs with dingoes, and later added other influences, to get a tough, quiet worker that nips at heels. Adults are compact and muscular, about 35 to 50 pounds, with a weatherproof double coat in blue or red speckle.
That working history explains the personality. Heelers tend to be loyal, clever and alert, often attached to one person and wary of strangers. They have plenty of stamina and a strong urge to chase and herd, which can mean nipping at bikes, kids or other pets. With training and a real outlet for that drive, many become devoted, hardy companions, though dogs vary widely.