pillowcases will cover them all the way up to around the knee, which is as far as I need to go.
I put a drawstring (using parachord) in the hemmed end of the pillowcase to make it draw up.
now that I think about it, I've used them on one cow and two bulls. neither bull was HUGE, but one was a good sized 5x5.
I hope for a repeat performance in a month.