I am trying to find something I saw somewhere that can guide me to determine what work level (light work, moderate work, etc) and the feeding guide for this.

I am certain I have seen this somewhere.  For recovered laminitic PPID and IR horse.
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Kandace K
Rocky Mountains, Alberta, Oct 2020
K and J (over the rainbow bridge) and now T
https://ecir.groups.io/g/CaseHistory/files/Kandace%20J%20and%20K
https://ecir.groups.io/g/CaseHistory/album?id=259062