One day when I was calling my horses in from the pasture, my young colt did not come up with the rest. I called and could hear him behind some trees yelling, but he never came out. When I went out to investigate, I found that someone had thrown a bundle of old barbed wire into our pasture. My nosey little guy managed to get all four legs tangled up in the mess. The wire was extending all the way up his legs to his body. You can imagine the freaking out I did. And, from the looks of the poop that was around him, he had been there all day.
Anyway, after cutting away all the barbed wire, there were only two small very superficial scratches on his legs.
I am going to guess it had to do with his training, about giving to pressure, but I am so thankful that he was smart enough to not struggle and cut himself to pieces.