Horse doesn't use back
I've had this horse for about 5 years now and even before I bought him he had some issues. His feet had been shod wrong when he was a colt which in turn caused him to not use his back while he walks, trots, etc. and develop a sway back. I have a ton of exercises that I am doing with him, but for the past year now there has been absolutely no improvement. I've tried cavalettis, trotting poles, back raises, side riens, new bits, stopped riding with a saddle, streches, hills. I know it doesnt happen over night but after a year of no improvement I need some new ideas. Any help would be great thanks!