Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Lynette,
From what you describe, he may be prone toward laminitis. Does he have a cresty neck? Fat deposits on his rump? If so, you should give him Quiessence --a magnesium/chromium supplement to reduce his circulating insulin levels.
I would also suggest that you replace his alfalfa hay with grass hay, for now.
This time of year, in Texas, the pasture is not really a concern, but if the Quiessence and removal of alfalfa doesn't help, you may have to limit his grazing to only the early morning hours when the sugar levels are at their lowest.
6 lbs of Safe Choice may or may not be too much depending on how much feed he needs. If he appears to be overweight, then you'll want to reduce that.
Grass hay is your best bet, all around, along with a small meal plus a good vitamin/mineral supplement and Quiessence.
Hope this is helpful!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO