The inside of my mare's hind legs are always scraped up. They are never really cut or bleeding or anything like that, but they have missing hair where is looks like she has scraped herself. I imagine she nicks herself with her hooves while she is lying down in the pasture, but I don't know if or what I should do about it. Should I try to prevent this or just let it be? It isn't painful, but it doesn't look too pretty either.