The Australian Cattle Dog, also known as the Australian Heeler, Hall's Heeler, Queensland Heeler and Blue Heeler, is a courageous, tireless, robust, compact working dog. The dog is agile, well-muscled, powerful and determined while working. The length of the body is a little longer than it is tall. The tail is held moderately low, hanging at a slight curve. The front legs are straight, strong, round bone, extending to the feet. The feet are round and the toes are short.