Despite its name, the Australian Shepherd, often known as the Aussie, was actually developed on ranches in the United States during the 19th century. They are a medium-sized breed with a robust, balanced physique; their coat can be straight or slightly wavy and comes in various colors including blue merle, black, red merle, and red with or without white markings and tan points. Aussies have alert eyes that may be brown, blue, amber or any variation or combination thereof.