For prevention and protection of the scratches areas that are already there, I agree with putting a thick layer of Desitin or similar on the area/s BEFORE he is turned out. This will provide a barrier from dew and moisture which are culprits. Also, believe it or not, I've used that liquid aluminum spray on scratches in the past to "suffocate" them, and it helped, and is another way to apply a barrier from moisture.
"I have never let my schooling interfere with my education." - Mark Twain