The Australian Cattle Dog (ACD or Cattle Dog), is a breed of herding dog originally developed in Australia for driving cattle over long distances across rough terrain.He is also known as the Australian Heeler, a name derived from the manner in which he manoeuvres cattle, crouching low behind them and nipping them on the heels.
A dog of great stamina and endurance, he is wary of strangers, and protective of his herd and property. He requires plenty of exercise to keep him in hard muscular condition, is very alert, and has an implicit devotion to duty.
The breed was created from intensive and careful crossbreeding when it was found that imported herding dogs could not control tough cattle on long treks to market. Behind the Australian Cattle Dog are breeds such as the Dingo, the Kelpie, the Dalmatian and the Bull Terrier, but the breed has been purebred since the mid-1890s.