My horse experienced odd lack of performance, hard in the mouth, less supple, resisted and revolted to leg yields like tossing head in air, very lazy, stabby short step in hind end, loss of suspension. Fiat movement. Dull. This was just mild at first and came and went. Tried so many things! Vet found SI pain. Gave SI injections no results. Observed very mild short step in right hind like the very first steps on the lunge some days. But went away. Kept getting worse. Tried bute, got worse. Then started getting kicky for grooming on the right side and I thought omg ulcers! Found ulcers finally. I really thought I was dealing with a musculoskeletal issue. Nope!