My mare has almost high withers (can't really see it in the pics), no rump, and a flat back. She also has the strangest shaped chest I've ever seen on a walker. She looks more like a thoroughbred. I'm considering taking her the HJ route because she loves to jump, and earlier I was trying an old saddle of mine on her and I realized how flat her back was. I longed her with full tack, and realized how difficult her saddle and girth were going to be. I had to pull the girth forward seven times before I gave up and took it off her. It was one of the rubber stay in place girths too, with a stay in place saddle pad.
Any suggestions? She is amazing at jumps, but has tack issues.
Please ignore how weird she looks in these pictures, this is before I rescued her and she has built up an insane amount of muscle since then!