The Australian Cattle Dog (ACD), or simply Cattle Dog, has been nicknamed a "Red Heeler" or "Blue Heeler", "Queensland Heeler". It is a breed with a goal of being the perfect herding dog.
In the early 1800s, Australia's first cattle dogs were the Smithfield, imported from the British and could not meet the challenges of the Australian interior. And the stockmen began a long process of breeding a more suitable herding dog to the environment.
ACD has been proved to be an excellent choice for herding in practice. And its popularity grew rapidly throughout the 19th century. Eventually, it became popular in the United Kingdom and the United States, as well.