He looks like he has been cut up by getting tangled in the barbed wire fence that he is enclosed in.. there are scars on his right hock and gaskin.. cuts on his chest and side. VERY lucky he did not get his lower legs in that mess... though it is only a matter of time looking at the next to last photo with the 4 strand barbed wire fence next to him. See the cuts on his side and chest and legs? Also in the first post, look at photos 3 and 4.. this guy has been really cut up!
Barbed wire is a bad horse enclosure.
There is also that low feeder that is for cattle that is just an accident waiting to happen for a horse.. all sorts of places for feet and legs to get tangled.
He is really a nice horse. Can you get him out of that situation? Very dangerous.