Turning him in the paddock, with a babysitter, was the best approach IMHO
BUT my question: Has anyone been poulticing wrapping the leg???
Due to a really bad trim by a well-schooled and expensive farrier, I am currently nursing my foundered horse back to health from torn ligaments and sesamoiditis in both front legs.
He comes in at night to a stall with mats and shavings.
He goes out every day in the half acre side yard, beside the barn, with my 26 yo Arab who, like your mare, is a great babysitter.
I wash, clay poultice and wrap his front legs twice a day. After the clay poultice goes on, I vet wrap, then quilt, then put the standing leg wraps on.
He also wears trail riding boots, with home made Lily pads in them, ALL DAY while he's outside. The boots & pads were originally for bringing relief from the founder but it seems they have also served to help reduce stress on the torn ligaments.
He has made progress since all this happened on July 19th but it has been grueling/cumbersome/time consuming/frustrating work. And it will continue until "Who Knows When"
He does not have any swelling or heat in his legs. The lumps in his fetlock joints were double the size of a golf ball but already have reduced by about 50%; they do have some heat in them but nothing like before.
I said all that to say, if your horse isn't at least being wrapped every day, that might be why he's not healing like he should be --- there's nothing being done to help relieve the pressure of 1,000 pounds walking around on those damaged tendons.
My vet is a leg specialist and death against stall rest, except under the most life-threatening of conditions but, the horse needs a lot closer monitoring and attention when they're not on stall rest.
If whomever is watching your horse does not have that kind of time, it puts the horse in the predicament of really extending the healing time and perhaps never healing up to 100%
I am so sorry you are so far away and have to depend on others. As far as what can go wrong in the new situation? They won't watch him close enough, until the day comes that he is REALLY three-legged-lame and somebody casually says "ohhh, I think we should call the owner----".
Getting back to your horses original set up at your parents' home:
The horse would need two sets of standing leg wraps, two pairs of leg quilts and, if only one leg is involved, probably one roll of vet wrap would last two days. Plus the clay poultice.
IF your parents were willing to spend the $$$ on those supplies, is it possible your best friend (whose horse is at your parents) might be willing to wash his legs, poultice and wrap him every day?
It's supposed to be done twice daily but maybe that could be stretched to once a day if you use the "Sore-No-More" with arnica. I put it on my arthritis hands and wrap them with vet wrap when it's time to trim my horses.
Sore-No-More isn't at all offensive and won't burn the horse's skin.
And, last but not least, it would go without saying: ask the vet's opinion on all that first; I'm just sayin' what my vet told me to do
After I've said all that, I am waiting for you to come and say he IS already being poultice and wrapped. To which my reply would be the vet really needs to see him
Whatever decision is made, good luck for a healthy outcome