Herding Sheep by Horseback in Iceland

Each year riders go into the highlands of Iceland and herd the sheep to their winter quarters on farms.  You can book excursions to this yearly event.   I believe Blessi was ridden in sheep herding.  He was very interested in the deer when he first encountered them on a trail ride.  He seemed to categorize them as odd-looking sheep, apt to spook and silly movements but something harmless we could herd.