Lamping 3-4 nights a week is massively more risky than a collie working 7 days a week....has some emotional nights lamping/injuries....worked as a shepherd for a long time and seen very few injuries to speak of...had a good dog killed in 1985 when he fell 100ft off a quarry...still alive at the foot of the quarry too with his tail wagging when I got to him...died in my arms on the way home...a good dog....