I have a pacer. He’s 13 now, at the height of his schooling he was doing 2nd level pretty comfortably and schooling a lot of 3rd. He also schooled over lower jumps and was quite good at that naturally. The canter took literally years of strength- and what everyone is saying here- hills, poles- getting the back up and loose. We did a lot of trot poles- not set wide to lengthen the trot but set to lift the legs- trot in/through and canter out. Some things he did shockingly well and were non issues, and others he struggled with to the day he retired.
Mine has never been that particularly motivated to move- definitely more of a push ride. He’s a very sweet, calming force in the barn, and when he was being ridden, out and about. He could go anywhere and would be the same sweet old self- shows, trails, beach, parade- you name it he was game for it.
People who know him love him for his personality (he’s a barn favorite both with people and horses) - but those who know him know how much hard work it was over the years to get things that are much easier for other horses. And even then, in the dressage arena most of his work was passable but never competitive. It didn’t really matter to me, the reward for me was just getting him to the level.
EPM halted his career and he’s now basically retired. He can do light walk trot and some canter. To be honest if I wanted to get very serious about reconditioning him he could probably get back up to a decent 1st, maaaybe second level. But for him it is SO much work (and for me), and we’re both happy as-is. If he were my only horse, maybe I’d give it another go. He owes me nothing, and just seeing his face at the barn every day is good enough for me.