Dogs 101 - AUSTRALIAN CATTLE DOG - Top Dog Facts About the AUSTRALIAN CATTLE DOG - Duration: 4:38. The Koolie (also known as the Australian Koolie or by the historic misnomer "German Coolie") is an Australian dog breed. The Blue Heeler German Shepherd is a mix between the German Shepherd and the Australian Cattle Dog. The Australian Cattle Dog German Shepherd mix is a very intelligent, loyal, loving, and protective breed.

To know more, check the article. The compact but muscular Australian Cattle Dog, also called Blue Heeler or Queensland Heeler, is related to Australia’s famous wild dog, the Dingo.
The Koolie is a working or herding dog which has existed in Australia since the early 19th century when it was bred from imported British working dogs. Brooklyns Corner 159,988 views

There are many different characteristics for this breed.