When I was about 9 I saw a book at the public library with a black and white dog on the cover. It was in the adult section but I borrowed it for the dog cover. The story was about farmers and small holders in the Lake District in northwest England. And inside the story I was introduced to the Border Collie, and its incessant drive to herd, anything. One of the puppies tries to herd stones in the yard, he's that driven. The book is Rex by Joyce Stranger if any of you are interested.Watch out for herding breeds - some of them are so herding oriented genetically that they will move the sheep and goats back and forth all day. I knew a woman that had Border Collies that she trained for herding and showed in trials. She also raised sheep and had to kennel the Border Collies or they would herdher sheep around all day!