Join Date: Dec 2009
Location: Ft. Worth, Texas
WOW, that's a big saddle. For a POA, it will probably be too long and will hit the horse too deep in the back. I have a short-backed AQHA gelding that is only 14.3 and I cannot use a saddle that is longer than 27" (front to back) on him as it hits too deep and he will buck. Unfortunately, there is absolutely nothing you can do that will make it fit if the saddle is too long.
My suggestion.....fix the saddle up and sell it or trade it for something that does fit. It sounds like your mom got a good deal, so clean it, polish it, and sell it for a profit so you can buy something more appropriate for you and your pony.