The horses don't bother the barbed wire and the barbed wire don't bother the horses... we've never had a problem. :)
And if you have any suggestions about his ribs please let me know... He has 25 acres of green pasture so the guy eats all day, and we feed him 1 feeding of grain each day.
I don't know what else to do I've noticed he is a little ribby, and yes he's on de-wormer