I usually do a lot of hunting ferns when sheep are about getting the dogs use to them bolting !!
Last summer a very young lamb bolted out infront of my blue bitch out of ferns she's didn't move just carried on walking heart in mouth though !! This Hancock pup has been my hardest to break !! She doesn't chase them she tries to herd them to me she doesn't know but can still see her stare at them something I need to work on !!