My 15-year old quarter horse was giving me a lot of trouble with trotting and loping beginning about two weeks ago. She would put her head down very low and turn off to the left when asked to trot or lope. After two days of this, I had a trainer at my barn ride her to see if she might have an injury or whether she was just being bratty. She rode her around the arena a few times and said she was just being difficult. I gave her a couple of days off from riding, and last Saturday she did much better, did trot and loped briefly, although her lope was very clumsy and jarring to me. When I went out to get her Monday this week, she could hardly walk. The farrier who did her feet about 3 weeks ago was there, and both he and my trainer checked her and suggested I call the equine chiro. He adjusted her and said she was just very sore and to give her a week off. My question is that I was riding her a lot more, say a month or so ago, and never had any problems like this. So why would she all of a sudden have such a severe soreness problem? The only thing that has changed is that it has gotten cold here, in the 30's at night. A little history... she was a cutting horse and has been brood mare in pasture for over 10 years. She is now 15. I pulled her out of pasture late July and have been slowly getting her back into shape for trail riding. Put about 50-75 pounds on her since she was thin. Chiro report says poll was out on both sides, rotated pelvis, femoral head tenderness & tightness in stifles and paraspinal muscles & sacrum tightened up. Rib 8 rotated & tender. Seems like she maybe got into a little accident, although there were no scratches/scrapes on her anywhere. Should I learn how to wrap her legs for support? What do you all think? Oh, and there was no swelling, nothing was hot, feet OK. Thanks for your help! I am newbie horse owner.