Australian Cattle Dogs, also called Blue Heelers or Queensland Heelers, were developed in nineteenth-century Australia to drive cattle over long distances in heat and dust. They're compact, muscular, medium-sized dogs, usually 35 to 50 pounds, with a short, weatherproof double coat in blue or red speckle. Puppies are born white and color in over the first weeks.
Heelers are loyal, alert and sharp, and many attach closely to one person while staying reserved with strangers. The herding instinct can show up as nipping at heels, chasing bikes or bossing other pets. On busy sidewalks and popular trails, training and a real daily job matter. Most mature around age two, and with enough activity many live 12 to 16 years.