Originally Posted by Spyder
Then maybe this isn't the time to be looking for another horse. There is nothing wrong with the appy you have. That horse just needs to be ridden more aggressively forward instead of you just following along with the gaits it offers you.
And as far as the horse liking only the western saddle, I really don't think ANY horse just arbitrary decides they don't like a specific saddle that is discipline related...more like the rider likes or dislikes the saddle.
That did make me chuckle about the horses liking saddles ;D
Dressage takes a lot of work ( I have never ridden western so cannot comment) particularly from the legs and core muscles. You'll struggle if you don't have a relative level of fitness.
I don't know about your appy, so won't comment, but in all honesty I believe pretty much every horse has the potential, some just need a firmer nudge in the right direction.
For getting fit now the winter is coming in, lots of walking is a good idea, and try things to help build up your core.
As much as I would like to say the horse will wait for you to get fit, it won't, and there is nothing worse than the feel of exhaustion and thinking you've got to get back on tomorrow when you can barely mount from muscle ache.