"Cattle Dog" is a label more than a single breed. In adoption listings it usually means an Australian Cattle Dog, the Blue or Red Heeler, or a mix with one, and sometimes a Texas Heeler or a cross with a Border Collie or Lab. The Australian Cattle Dog was developed in nineteenth-century Australia to drive cattle over long distances by nipping at their heels, which explains the stamina and toughness.
Most are medium-sized, muscular and short-coated, weighing roughly 30 to 50 pounds, with a double coat that sheds moderately and more heavily with the seasons. They tend to bond closely with their people, stay reserved with strangers and get bored fast without a task. Mixes vary in size, coat and energy, so a dog's day-to-day behavior says more than the label does.