Sheep like other animals, usually have a mind of their own. They are lead by their stomachs, so if the eating is good in front of them they will head that way. They can cover a lot of ground in short order. Thankfully, you have a good crew. Ever think of a sheepdog? My granddad had one on his homestead. Well trained and never bothered the other animals (chicken, geese, ducks, turkeys and guinea fowl). Made his one-man operation a lot easier.
We have thought of sheepdogs, especially recently.