Nancy and Carol, thank you!! I'm including these in my list of questions when I call my vet. I'm going to keep trying to get him interested in treating my horse, and am going to see if he will consult with the hospital at Guelph. I am also waiting to hear back from the surgeon I was referred to so I can ask some questions. I'm very concerned with the impact of surgery on a horse his age. 
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Allison in Ontario 2020

Case History: https://ecir.groups.io/g/CaseHistory/files/Allison%20and%20Sonseeahray
Photo Album:
https://ecir.groups.io/g/CaseHistory/album?id=254641