Thanks guys i didn't think of food or bedding.
Previously she was fed crimped oats, alfalfa pellets and corn - which desert helped me reqrrange her diet as that was clearly too rich for her. Almost four months ago i switched her to nutrena grass balancer with omega supplements and a calming supplement. i started both supplements as 'ultra' until i used that batch then switched to regular - to give her a head start. With the diet change she has lost weight - to a much more appropriate levels, she still jiggles a little but she's looking much better.
She gets hay constantly throughout the day - unfortunately i change hay allll the time - my supplier gets it from all over to be sure to have some at all times.
As for bedding i use all soft wood certified horse wood pellet bedding. I've used multiple different brands and noticed no difference - but wasn't really watching carefully or tried any one long enough to really see a change. I have a year supply of what i've got now and can't afford to buy more on a guess but i could try a month or two of somethjng different next windfall.
As for how long- she's had it since far before i got her a little more than a year ago. She was kept in a dry lot, no stall, no bedding, no protection from bugs. She had rubbed her neck, mane, face, belly and legs almost completely bald. Since i've had her, her mane's grown back and her itching has centralized to just her belly- i think having shelter and bug spray made that improvement. She has definitely improved since the diet change, but she just isn't 'better'.
As for wormer - i asked my vet about burrowing insects and she said it would look very different - like tiny hives- not just dry, bald, scaly patches.
Thank you all for helping - i'm really at a loss. I'd like to avoid drugging her- consideribg this is an ongoing issue, but she may need that in the bad months.
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