The spots are from ill fitting harness, I'm positive. Thanks guys! I should explain more, I think I'm giving a bad impression LOL.
I did not grant permission for them to use her. I had no idea it was happening, and I was visiting her often (Every day/ever other day) at the time. I just happened to come out one morning and oh, wow, they're untacking my horse.. Ok.. They gave me money off my board, but I told them not to do it again. I promise I didn't know this was happening, or I would have stopped it. And now that I'm thinking about it, gosh.. I'm so trusting. They have probably used her much more than that without me knowing, maybe? Ugh. IDK.
I'm trying to get pics, but my phone camera isn't working right now! And I don't have any other cameras currently (Not at my house, anyway) but I have a vet appt in a about a week.
I think I might be making it out worse than it is. She's in no obvious pain, no heat in hooves, no lameness, not underweight. Just some mud, bad hair (like 14 inch long hair in one spot, 3 inches in another..) and actually, no rubbing on her tail, surprisingly.
I'm under a lot of stress right now so I'm having a hard time trying to learn about hooves/anything really. I've cut out a lot of the "bad" in my life this week, still adjusting though. Then I plan on hitting the books, maybe getting some hands on experience. It's not that I don't want to learn -- I'm just incapable right now.