Being away on retreat for a week resulted in some great video references. I grew up on a sheep farm and actively tended our herd from about the age of six, hauling water, feed, culling lambs, helping out with shearing. While we had a collie who sometimes surprised us with his herding instincts, in England I got a hit of the mastery of sheepmen with their dogs and you really see it here on display. It might strike you as a bit rough on the sheep, but from what I know of people who work so closely with animals, this is more of a display of creativity than any harm to the sheep. [youtube=http://www.youtube.com/watch?v=x3qvJgY9XQI]
Thank you, Mark.