Sand. Do you have a sandy area where they can roll? In my pastures that don't, I take a couple of skid loader buckets and make them a pile of it, then they do the work.
Other than that, I use a shop vac while I am using a shedding block - sucking up the hair as I loosen it. Keeps it contained, out of my eyes & mouth and makes it easy to clean up. Definite win/win!
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.