The horse I'm looking at right now has a pretty bad sway back, and I was wondering if I should pass him up because of this. It doesn't hurt him, and he can fit a regular western saddle fine as long as he's got a thick enough pad. But, it's definitely a confirmation issue. He's been out of work for about a year, so I know that I could get it up at least a little with regular riding, cavalatti work, underbelly scratches, and keeping him on a low contact so he doesn't hollow his back out, but I don't know if this could lead to serious complications later. He's 16, by the way.
I don't plan to jump him (with the exception of hopping over a log on a trail every once in awhile). Just a trail/pleasure horse, mostly. He's got a lot of great assets and I'm seriously considering bringing my trainer out to take a look, too, but I was just wondering if I should even bother her with it.