Australian Cattle Dogs, often called Blue Heelers, were developed in nineteenth-century Australia to drive cattle over long distances, and the name comes from nipping at the heels. They're compact and muscular at 35 to 50 pounds, with a short, weatherproof double coat in blue or red speckle.
Heelers are loyal, quick and alert, often bonding with one person and staying reserved with strangers. Their herding instinct can show up as nipping at heels or chasing bikes, so Sioux City's sidewalks and trails call for a secure leash and early training. The dense coat suits Iowa winters, and the breed commonly lives 12 to 16 years, so adopting one is a long commitment.