" The sheepdog trial is a contest of farm and ranch dogs doing the same work they do every day at home. It's a simple test: dog runs out, gathers sheep, and fetches them to his shepherd. Dog drives the sheep through obstacles. Then dog and man sort the sheep and pen them. Any halfway decent sheepdog can do it but some are better than others "

― Donald McCaig , Mr. and Mrs. Dog: Our Travels, Trials, Adventures, and Epiphanies