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 United States during the 19th century. The Australian Shepherd most likely is the descendant of Carea Leonés, Pyrenean Shepherd and Old German Herding dogs that were brought over by shepherds. Also, great variety is seen in the Aussie's eye color, and they are often heterochromatic. An early nickname for the breed was 'ghost-eye dog'. Also, great variety is seen in the Aussie's eye color, and they are often heterochromatic. An early nickname for the breed was 'ghost-eye dog'. The shepherd should be brushed weekly to maintain a healthy and clean coat and also to prevent matting. Being a 'working dog', this breed should be outside to get its needed exercise. If a dog is dirty, a basic bath can be given, but not frequently, for it can dry out the skin and coat.