Loading sheep into the trailer with a dog

we were loading sheep today and moving them off some winter grazing that we had for them.
this is land is in county Wicklow in Ireland. These are Lanark sheep. they are mainly found in Northern Ireland or Scotland are typically known as "Blackies. they are a mountain breed of sheep are particularly hardy and have great mothering instinct at lambing time. they can be very protective of their lambs.
this sheepdog is called Ben. i compete with him in nursery trails. he is a beginner in terms of sheepdog trials.
there are about 200 of these ewes in the field at the start. we gather them and split off about 25 sheep. we take the 25 and put them on the top deck of our double floor sheep trailer. then we go back and split out another 25 to go on the bottom floor. so we can bring home about 50 at a time. so four runs should have them all home
'