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What kind of help do you need? Has the horse been diagnosed, and what are you hoping to do with it in the future?
Your best bet is to read up on the subject online, especially Dr Beth Valentine's online "virtual vet" community. Here are several great articles about what it is, how to test for it, and how to "treat" it. She helped me with a horse with PSSM and I still feed the high-fat low-sugar diet to this day to non-PSSM horses after all the research I read.
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"I am all for reaching out, but in some situations it needs to be done with a rolled up news paper." Alagirl
My mare has been diagnosed with PSSM I have read every thing that has been written by every Vet. I have changed feed worked my way back to riding as suggested. I wanted to know if she will ever be normal again. I (am trying to) ride Dressage, she had a soft back before this syndrome occured. I don't know if I should lunge her a long time before I ride or short lunge then ride. Is stress a problem, such as a trailer ride? Is there anything I can give her to aid in her returning to normal? Thanks for any pearls of wisdom.
If it's any consolation my TB has PSSM and once we found the magic percentages he became a better horse than he ever was before. We compete in dressage and are successful
This is where it gets frustrating for owners. What might work for PSJ's horse may not work for mine and vice versa. It's a lot of trial and error. Also when researching you will find that PSSM, EPSM, and RER are pretty much the same disease but refer to the specific breed of horse.
Vitamin E si very helpful as well as a magnesium supplement such as Quiessence. Check Selenium levels too.
Besides a sore, tight back what other symptoms is your mare experiencing?