[sheep-dawg, -dog]
a dog trained to herd and guard sheep.
Also, sheep dog.

1765–75; sheep + dog Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sheepdog (ˈʃiːpˌdɒɡ)
1.  See Border collie Also called: shepherd dog a dog used for herding sheep
2.  Old English sheepdog See Shetland sheepdog any of various breeds of dog reared originally for herding sheep

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
His role, he said, is that of a sheepdog with the training and temperament to
His campaign is cast into doubt when he comes upon an ancient ring that
  transforms him into a fat sheepdog.
He found a new all-purpose breed in the local sheepdog's strength and
He gave a working sheepdog demonstration at the ranch.
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