Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Judy,
I would not limit her hay -- she should never run out. Putting a horse on a "diet" should never include limiting forage. If, perhaps, you're giving her treats such as carrots and apples, then you may want to reduce those. And, if you're giving her any grain (oats, corn, barley, etc.) then you can cut back on that (I believe you told me some time earlier what you were feeding, but I don't recall the specifics).
So, to answer your question... No, do not reduce her hay. Increase her exercise if possible, or place her hay in piles throughout her paddock area so she has to walk over to get it.
Forage is the best thing for her and will keep her healthy and free from cortisol-related weight gain caused by the stress of not having enough to graze upon.
Keep me posted,
Dr. Getty 
Where are you from? Bayfield, CO