http://dogcollarsbowwow.com/2011/06/24/neil-mcdonald-educating-dorpers-with-working-dogs/

This is a good link and an interesting video about educating sheep with good dogs who happen to be kelpies but the same rules apply to all dogs!

This is a lesson with pot sheep on theory...Heidi's sheep go viral!

http://youtu.be/oShg3UAChXk

 Thankyou to Olga! I couldn't have put it better myself!!!