Dog Puzzle: Cattle Dog

The Australian Cattle Dog (ACD or Cattle Dog), is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain. In the 19th century, New South Wales cattle farmer Thomas Hall crossed the dogs used by drovers in his parents' home county, Northumberland, with dingoes he had tamed. The resulting dogs were known as Halls Heelers. After Hall's death in 1870, the dogs became available beyond the Hall family and their associates, and were subsequently developed into two modern breeds, the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog. Robert Kaleski was influential in the Cattle Dog's early development, and wrote the first standard for the breed.

The Australian Cattle Dog is a medium-sized, short-coated dog that occurs in two main colour forms. It has either brown or black hair distributed fairly evenly through a white coat, which gives the appearance of a "red" or "blue" dog. It has been nicknamed a "Red Heeler" or "Blue Heeler" on the basis of this colouring and its practice of moving reluctant cattle by nipping at their heels. Dogs from a line bred in Queensland, Australia, which were successful at shows and at stud in the 1940s, were called "Queensland Heelers" to differentiate them from lines bred in New South Wales; this nickname is now occasionally applied to any Australian Cattle Dog.

As with dogs from other working breeds, the Australian Cattle Dog has a high level of energy, a quick intelligence, and an independent streak. It responds well to structured training, particularly if it is interesting and challenging. Although not aggressive it was bred to bite, and owing to the strong attachment it forms to its owners can be protective of them and their possessions. It is easy to groom and maintain, requiring little more than brushing during the shedding period. The most common health problems are deafness and progressive blindness (both hereditary conditions) and accidental injury; otherwise, it is a robust breed with a lifespan of 12 to 14 years. Australian Cattle Dogs now participate in a range of activities beyond the herding they were bred for, including competing with their owners in sporting events and working as assistance dogs.