Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Kim,
I'm so sorry to hear that he's done so poorly while away. It sounds as though he was under much stress, both physical and mental, to have had such a toll taken on his condition.
The first step, of course, is to have his teeth taken care of. Then, I would discontinue feeding the Senior Feed, since it is grain-based and you mentioned that he is prone toward laminitis.
Instead, continue feeding the beet pulp and the alfalfa, along with grass hay. Soak the hay and drain the water, if at all possible, since you don't know what the sugar and starch level of the hay is. Having it tested is always ideal, to reduce his risk of laminitis.
To this meal, he should have a good multiple vitamin/mineral supplement. I would recommend Reitsport HA-100 for him. It is flaxseed meal based, which provides essential omega 3 fatty acids. This will also provide amino acids to help him build body tissues.
And, in addition, give him Ration Plus to help him efficiently utilize his forage intake and help him gain weight.
This is a start. If you find that he is still not doing well after a month on this regimen, let's plan on setting up a phone visit to go over his entire situation in detail.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO