Wiktionary
n. Any breed of dog developed primarily to assist humans in performing tasks, such as farming, controlling livestock, law enforcement, or assisting the blind.
WordNet
n. any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs
Wikipedia
A working dog is a canine working animal, i.e., a type of dog that is not merely a pet but learns and performs tasks to assist and/or entertain its human companions, or a breed of such origin. In Australia and New Zealand, a working dog is one which has been trained to work livestock, irrespective of its breeding.
Within this general description, however, there are several ways in which the phrase is used.
- To identify any dog that performs actions on a regular basis to assist people. In this context, a dog that helps a rancher manage cattle or that performs stunts for a trainer who receives pay for its acts is a working dog, as is a service dog or an assistance dog. This might be in comparison to a companion dog, whose purpose is primarily as a pet.
- To distinguish between dogs that are bred for appearance primarily to win conformation shows and working dogs that are bred primarily for their ability to perform a task. For example, a Border Collie that is a conformation champion is not necessarily a good sheepdog and a Border Collie that is a champion at sheepdog trials might not succeed in show rings for its nonstandard appearance. It is also possible that a specimen may excel in both appearance and performance. In many FCI countries it is impossible for some working breeds' dogs to become conformation champions without having passed adequate breed specific tests measuring their working abilities.
- As a catch-all for dog breeds whose original purpose was to perform tasks that do not fit into a more specific category of work. For example, until 1983 herding dogs were part of the Working Group. The Herding Group was created when the Working Group became too large. Today, the American Kennel Club uses Working Dogs to describe breeds who were originally bred for jobs other than herding or hunting. Such jobs might include pulling carts, guarding and so on. However, in practice these 'show' dogs under the AKC are not proper working dogs, and would indeed not be suitable for use as such. Many true working breeds are still very valuable as working dogs, and without them local economies would suffer. An example of such a breed is the Anatolian Shepherd, without which many sheep would be destroyed for example by wolves, feral domestic dogs, and in Namibia, the cheetah.
Usage examples of "working dog".
However, Beowulf is a working dog and I don't think he likes the idea of lying around for a full month with nothing to do.
He is a working dog--quite harmless, actually, unless ordered to be otherwise.