Australian Cattle Dogs, also called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to drive cattle across long, hot distances. Settlers crossed collie-type herding dogs with dingoes to create a tough, quiet worker. The result is a compact, muscular dog of roughly 35 to 50 pounds with a weatherproof double coat in blue or red speckle.
That heritage still shows. Heelers are smart, loyal and alert, often attach to one person, and tend to be reserved with strangers. Their urge to chase and herd can come out as nipping at heels, bikes or other pets, so training matters. A dog built for heat and dust has a head start in Midland, but it still needs a real outlet for its drive every day. Dogs vary, and breed alone doesn't decide temperament.