I used to work on a farm that had Blackface, which are hill sheep like Herdwicks. They didn't seem to enjoy being confined to a field - maybe it's the history of the breed. But they went anywhere they wanted - but once they got there, they seemed to stay there, if you know what I mean. We had one ewe who, wherever we put her, came back to the verge beside the stackyard. She seemed to think that was her "place" - brought her lambs back as well. In the end we just left her there - she didn't wander from there.