Hi guys, any/all experiences with this would be helpful. Vet is at a loss.
Looking for a physical reason for a horse being unwilling to pick up a right lead.
Horse in question HAD both leads perfectly. Zero set up required, on the buckle, no bridle, whatever. Would pick up the lead corresponding to direction of travel 100% of the time under saddle and on lunge.
In October 2019 the right lead started to become more and more difficult to get- more and more trot steps needed before she complied with the transition into right canter.
In November the lead was only there about 20% of the time when asked for.
December through today (March), it is at 0%, I can’t even force it. She just promptly picks up a left lead and counter canters no matter what. No trick in the book works. No matter what I do (haunches in, lifting inside rein, leg yield out of a small circle, approach the wall at 45 degrees, ask in corner, ask on circle with correct bend, leg yield into the wall then ask, etc.) On a lunge line, the lead is there about 30% of the time.
Weirdest thing is I can’t feel ANY lameness and the vet can’t see any lameness. Seems to be moving well. Vet just injected hocks, stifles, and SI with no change after each. Has a custom saddle, massage, teeth done, chiropractor out. Nothing changed it.
Any ideas? I’m at a loss and so frustrated 
Horse does have KS, but zero back soreness has ever been associated
Horse also has a decent amount of filling in both hind ankles- always been like that
