working dog

Pronunciation:			'wurking dog
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WordNet Dictionary
	Definition:		[n]  any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs
	See Also:		Bernese mountain dog, boxer, bull mastiff, bulldog, Canis familiaris, dog, domestic dog, English bulldog, Eskimo dog, Great Dane, guard dog, guide dog, hearing dog, husky, mastiff, police dog, Saint Bernard, seeing-eye dog, sheep dog, sheepdog, shepherd dog, sled dog, sledge dog, St Bernard, watchdog