My new mare is a buckskin AQHA registered mare. She used to be a reining and cutting horse back in the day. She is 20 years old, which is kinda old, but not too bad. She has a mild sway-back (see pictures). It doesn't cause her discomfort while riding or anything, and I have read that it can be caused by weak muscles in the back. Is there anything I can do to help hers? Thanks in advance!