Guard dog

A guard dog, an attack dog or watch dog is a dog used to guard against, and watch for, unwanted or unexpected people or animals. The dog is discriminating so that it does not annoy or attack familiar people.Both guard dogs and watchdogs bark loudly to alert their owners of an intruder's presence and scare away the intruder. The watch dog's function ends here; a guard dog is capable of attacking or restraining the intruder. For example, livestock guardian dogs are often large enough and strong enough to attack and drive away livestock predators such as wolves. Some breeds (such as Keeshonden) are excellent watchdogs but not excellent guard dogs because they bark loudly to alert their masters of intruders but are not given to assertive behavior. Similarly, even very small but attentive dogs (among a few other species) may function well as watchdogs.

Companion dog

Companion dog usually describes a dog that does not work, providing only companionship as a pet, rather than usefulness by doing specific tasks. Many of the toy dog breeds are used only for the pleasure of their company, not as workers. Any dog can be a companion dog, and many working types such as retrievers are enjoyed primarily for their friendly nature as a family pet, as are mixed breed dogs. The American Kennel Club also offers a Companion dog title for judged dog obedience competitions.

Canadian Eskimo Dog

The Canadian Eskimo Dog is an Arctic breed of dog (Canis lupus familiaris), which is often considered to be North America’s oldest and rarest remaining purebred indigenous domestic canine. Other names include Qimmiq (Inuit for "dog"). Although once used as the preferred method of transportation by Inuit in the Canadian Arctic, traditional working dog teams became increasingly rare in the North after the 1960s. This is often cited a result of snowmobiles becoming more popular, however it may also be the result of the alleged organized and systematic mass slaughter of Inuit sled dogs in the Eastern Arctic between 1950 and 1970 by the Royal Canadian Mounted Police.