Wrong result
Did they really do this? They used a trained sheepdog, that has been taught to herd them into a group. No if they'd used any old dog, it would have done a good job of just scattering them. Perhaps they'd like to repeat the test over here, I will give them the selection of bad tempered rare breed tups (rams) that enjoy (or not) their summer away from the ewes here. They are sort of the ovine equivalent of pit bulls, known to chase dogs, shearers and especially anyone armed with the wormer dosing gun.
If they used Herdwicks, they see the dog coming from half a mile away and hoof it, that's why Cumbrian collies have to be ruddy fast, or know how to sneak up on the wooly backed maggots.