When I was 20, I finally scrounged up enough money to buy my first horse and bought an OTTB from a local hunter/jumper barn in December of his 4 yr old year. He was restarted, had been out to some schooling shows, and generally seemed on the right track.
By March, I couldn’t canter him without him cross-firing and switching leads almost every stride. I don’t know if it was something the H/J barn knew about but was able to tune him up well enough to hide for sale or something that developed unexpectedly. Young horses have issues that crop up sometimes.
I didn’t have the money to go down the diagnosis road and quite frankly, didn’t realize I should have crossed off all of those boxes. This was my first horse. I just didn’t know.
Instead I spent weeks doing trot to canter transitions on a 20 meter circle, starting with a very light, low contact. I’d start with just trying to get 4 or 5 strides without swapping, then trot again. Eventually I aimed for a half circle, then 3/4 of a circle, then a whole circle. I slowly picked up the contact a bit, just enough to have an acceptable BN frame.
One day it was like a light bulb came on in his head and he stopped swapping on the flat. He still swapped and cross-fired while jumping.
I ultimately ran Advanced and 4*-S (back when it was CIC3*) on that horse. I didn’t have a single problem with swapping on the flat again until I started working with him on lead changes for Advanced. He counter cantered great (and I was extremely methodical about teaching him to counter canter) and could hold true canter great but once he hit Advanced, if he was tense he would swap or cross-fire. And he was often tense.
Even when I did eventually work through and start to get more relaxation in tests, I would almost always get one cross-fire per test. It usually happened in a corner, unrelated to any scored movement, and was back so quick that I almost never even got a comment from the judges about it.
Never was able to get him to stop swapping while jumping. He did it a lot and so smoothly that I grew to not even notice it. It was pretty slick of him and never hindered him but he definitely preferred to jump over a fence with his hind end on the left lead, regardless of what the front end was doing.
Having said all of that…no, I wouldn’t buy a cross-firing horse. If he’d been cross-firing during his trial I’d have walked away. I would have missed out on the horse of a lifetime but it’s still a huge red flag to me.
Can it be fixed enough to compete? Absolutely…depending on the horse. And mine was sharp as a tack, so I think the difference was that he figured out what he was supposed to be doing and did it.
But I think I lucked out more than anything. I wouldn’t want to gamble again.