working dog

working dog

noun
one of any of several breeds of usually large, powerful dogs originally developed to assist people in their daily work, as draft animals, guard dogs, and guide dogs, and including the boxer, bullmastiff, Doberman pinscher, Great Dane, St. Bernard, and Siberian Husky.

Origin:
1890–95

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World English Dictionary
working dog
 
n
a dog of suitable breed or training kept for its practical use, such as herding sheep, rather than as a pet or for showing

Collins English Dictionary - Complete & Unabridged 10th Edition
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