I have a 5 yr old 15h buckskin Azteca gelding, and after lightly lunging him I noticed his flanks have drawn up on both sides. I don't know how long its been there, but I haven't noticed it before. I already performed the pinch hydration test, which was normal, and after I put him away, he pooped and ate hay. I love my boy, and this is probably normal, but I just want to make sure. Thanks!