They are escape artists. Nothing but deer fencing (and a good one at that) will keep them in. Time is vital when handling deer. You do everything at half speed. I remember handling them one day and asked for a hand off the tenant shepherd. I sent him on his way after 10 mins, he just couldn't get it in to his head that they didn't respond well to shouting, roaring or waving an alkathene pipe around. If at first you don't succeed, give up. Try another day.