Douglas Harper's Etymology Dictionary
Usage examples of "sheep-dog".
The trap was set and the elephants were coming straight into it, chivvied and sheep-dogged by the low-flying Cessna.
Meanwhile the bull-dog, the black-and-tan terrier, Alick's sheep-dog, and the gander hissing at a safe distance from the pony's heels carried out the idea of Mrs.
It was the movement of control - the watchful crouch from which a working sheep-dog would spring, to bring to order the animals it was driving in a particular direction.