The Koolie or Coolie also known as the Australian Koolie or the German Koolie is an Australian dog breed. Specifically it is a herding dog a subcategory of a working dog. Koolies have existed in Australia since the early 19th century established through old photos owned by elder Koolie breeders and personal records such as diaries. The Koolie Club of Australia defines the breed based on its ability to work rather than on its conformation.