My horses tail is falling out!!

My mare has recently started rubbing her butt on the walls, fence, etc. like it is itchy. At first I think she was merely scratching it, but now I think she has irritated it and that is why she is doing it so often now. It's pulling a lot of her tail out, and it used to be so long and thick and pretty!! Anyways, anybody have any ideas on how to fix it, or maybe even what the problem is? She's about to be wormed, so I don't think that's the problem here...help!!!

Have you wormed her recently? Could be pin worms. Your vet can do a fecal to tell you if that is what it is. You will need to treat with a dewormer that works on pin worms and look up the recommended dosing times to get rid of them for good.

Also, have you looked at the skin on her tail? Could she need a betadine bath? Maybe she has dry skin?

I think some investigative work is in order.

You might want to check for lice and ticks, too. Both of those will make them itchy.

Yes, she has been recently wormed, and my friend (who is a vet) has checked her for them. Recently I have noticed that she had (and I guess this is the only way to put it haha) dandruff on her tail. Its not that she has a real dry skin there, she just had such thick hair. I've heard of it before, but what exactly would the betadine bath do for her? I know the circumstances in which to use one, but I'd like to know what exactly it does for the skin/tail?

And thanks for the advice!

I do a dilute betadine bath for anything scuzzy like rain rot on the back or the crud they get on the legs.

Maybe give her a bath then conditioner like coconut oil? Just be sure to check her every day when trying a new product on her. I would hate if she were allergic to coconut and she wasn't checked for days.

MTG. Smells terrible, works wonders.

Sweet itch? Mtg, fly sheet?
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Well, if she's about to be wormed then... then she's not actually wormed yet so... yeah, that could still be the problem.
Get her a good wormer (not a cheap ivermectin one) and try that. (You can wait a week or so and then give it).
Other than that, she may be dirty. Clean her butt and udders (and between then. A lot of mares have a 'pocket' in the middle of their udder).