I put a new clean pad under a semi quarter horse saddle and rode for about a half hour. Afterward where the saddle was sitting is clean and white, the rest of the pad is horse dusty.
Does this mean it's a good fit without a lot of movement? Or it's too tight so he wasn't sweating? When I feel under the saddle I feel contact along the whole underside of the saddle, no contact on spine, but I feel it may be too tight behind the shoulder.
Also, he does not want to move forward freely. Needs lots of nudging. Wants to back up. Is that a sign of shoulder pinching?