I also have a story about sheep dogs, when I was younger I spent summer nights throwing hay bails in the fields for my neighbour who had a farm. One of his clients was a sheep farmer, he had about 150 sheep or so and they would spread out in the field during the day. They'd break out in little hurds all over, but every night without anyone saying a word an hour or so before sundown, the 3 dogs would appear out of the barn and off they were in the fields. Within a half hour so there they were guiding the entire heard back in the barn for the night. It was an amazing piece of work to watch, the team work and communication between them was outstanding.