I used to think some horses didn’t like lower level dressage, and I had one. Every test from BN to T/P had comments like “tense” “tight” “nice horse would show more potential if he wasn’t so tight”… He was such a killer XC and SJ that we just endured the dressage phase to get to jumping.
But now, growing up a little, having many more horses that each taught me how little I actually know, I don’t think for low level dressage that there are horses “that just don’t like it”. They either don’t enjoy it because using themselves correctly is physically uncomfortable or unsustainable, or they don’t like it because perhaps the training is not clear or progressive enough. Asking the horse to use itself correctly is a lot of work and I am sure some horses don’t enjoy it at first – but it should be progressive and they should build muscle and strength to the point where LL dressage is not difficult for them.
Looking back on my first OTTB ever, who was as about loose as a tension rod, I remember how difficult it was for me to put down a good test with him. He never misbehaved or bucked but riding him was like riding a jackhammer. And it was not for lack or want of good training: I had the best training I could hope for as a teen. Knowing now what I know about him it all makes sense: it originated in the back. He had cervical arthritis show up blatantly and with a vengeance when he was in his 20s. I bet it was always there, but since he was never neuro, we never suspected it. We thought he just “didn’t like dressage”.
I think once you get into upper level dressage that requires true use of the back and collection, yes, there are totally horses who do not enjoy the physical demands of it. But LL stuff, like under Prelim’s dressage (or really, under 2nd level) is very basic ring work. I really think it boils down to either physical pain/limitations or frustration because of lack of clarity in training and aids.
LL dressage in my opinion does not ask anywhere near the same amount of physical effort as UL dressage… W/T/C with contact and looseness, suppleness and engagement – not collection – a horse of sound body and clear training should be able to do this readily and easily - and happily. If your LL horse is not enjoying dressage, in my experience it is because of a physical or training issue.
My current project (who is not free of physical ailments) is actually very good at dressage. I have the opposite problem with him; he loves his sandbox time and does not really like jumping or cantering out in the open. The reason is because the jumping and moving over terrain is much harder, he does not have great feet, and does not like hard ground because of it. All physical issues and I have questioned many times whether or not it’s fair to ask him to event… but he could play all day in a nice, cushy sand ring.