Sore trapezius muscles: vet or chiro? (Saddle fitter already lined up)
My horse has fairly suddenly developed sore trapezius muscles. I know it's sudden because I just had his back checked last month. For a bit of history, I posted on here somewhere a few months ago that his saddle pad had weird clean spots in the front, as if it were bridging. I asked the saddle guy, and he said that could be caused by bridging, OR a saddle that is too tight, and he told me how to check that. The saddle was too tight, but I have a Pessoa with exchangeable gullet plates, so I went the next size up.
This is about the time I had his back checked. He has been ridden more by a dressage rider lately, hence the change in his muscling.
Then last week, someone trying my horse for a possible lease put a way wide saddle on him (with shims, she claimed) that rocked and was generally just awful, and that was before she got on. She sat his trot quite a bit and he seemed to be going fine. The next day it was obvious that he was uncomfortable. That was last Sunday. He has had the week off, ridden only once in a bareback pad, and he's still sore.
The saddle fitter is coming out Monday, but if this doesn't clear up, is this a vet problem or a chiropractor problem?
I would appreciate any insight.