sheepdog

[ sheep-dawg, -dog ]

/ ˈʃipˌdɔg, -ˌdɒg /

a dog trained to herd and guard sheep.

Origin of sheepdog

First recorded in 1765–75; sheep + dog

Grossman has a name for the kind of person who sees the gun as protector in the opening thought experiment: sheepdog.

In Defense of a Good Guy With a Gun |Brian Castner |April 28, 2013 |DAILY BEAST
But Grossman would say that all I am doing is leaving the sheepdog burden for others, that I am choosing to live in denial.

In Defense of a Good Guy With a Gun |Brian Castner |April 28, 2013 |DAILY BEAST
The mop-haired pup, Beast, is a type of Hungarian sheepdog and frequently posts pictures and insight into his family life.

Who Is Priscilla Chan, New Wife of Facebook Founder Mark Zuckerberg? | |May 21, 2012 |DAILY BEAST
Like all good lurchers, she is bred between the greyhound and sheepdog.

Poachers and Poaching |John Watson

To this class belong most of the useful dogs, such as the spaniel, the setter, the pointer and the sheepdog.

Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 |Various
My comment on this story was that the farmer had displayed an almost incredible ignorance of a sheepdog—and a shepherd.

A Shepherd's Life |W. H. Hudson
Then sometimes you find all predictions upset, and all the big dogs beaten by a greyhound or an Old English sheepdog.

The Dogs of Boytown |Walter A. Dyer
I have had, maybe, a dozen dogs in all, the best being the result of a pure cross between greyhound and sheepdog.

The Confessions of a Poacher |Anonymous

sheepdog

/ (ˈʃiːpˌdɒɡ) /

Also called: shepherd dog a dog used for herding sheep See Border collie

any of various breeds of dog reared originally for herding sheep See Old English sheepdog, Shetland sheepdog