The Australian Shepherd, often known simply as the "Aussie", is a medium sized breed of dog that was despite its name developed on Ranches in the Western United States of America during the 19th Century. There is disagreement regarding the exact history of the breed prior to its arrival in the United States, and thus no official consensus on the origin of its name or association with Australia. 

They commonly were used to move huge herds of sheep and cattle between summer and winter grazing grounds. They especially excelled at managing livestock in tight quarters, such as alleys and chutes. In America, the Australian Shepherd’s popularity rose with the popularity in Western horsemanship after World War II.

The breed became well-known through appearances in rodeos, horse shows, television programs and movies. Despite this surge in popularity among companion owners, American ranchers continued to use and breed these talented dogs for their inherent herding instincts, versatility and keen intelligence.