NOW is a really good time to do a thorough check on your horses back health. If you don't fix any problems now you may not be able to enjoy riding as much in the warmer months, not to mention how your horse feels about it all. I am certified with Saddlefit4life to assess the fit of your saddle which is absolutely crucial to your horses back health & comfort as well as your own. I also recommend Muscle Rehab treatments to ensure the soft tissue is relaxed & not tight & constricted causing pain that just doesn't go away whether under saddle or grazing in the paddock. I'm highly surprised that soft tissue release treatments isn't listed in the treatment recommendations as it is non invasive & doesn't require manipulation.
Read more at The Horse : http://www.thehorse.com/articles/35826/clinical-signs-and-causes-of-back-pain-in-horses