Height: 13–18 in. Weight: 15–40 lbs. Life Span: 12–13 years The Australian Shepherds arrived in the United States by the late 19th century where the dogs’ qualities became recognized by local ranchers, who used the dogs to work cattle, sheep, and other livestock. The North American Miniature Australian Shepherds was developed in 1968, when two small Australian Shepherds were bred. They were a scaled down version of the Australian Shepherd. The goal was to develop a small herder and guardian who had the qualities of the larger Australian Shepherds but was smaller in size.