Should an FELV positive, feral cat with a dislocated shoulder (and other possible leg/paw problems) be tormented further with leg amputation? Or humanely euthanized?

I don't entirely disagree with Claudia's answer. However I would add possibly discuss it with a vet. The above mentioned animal hospital is a great place. The staff are the most caring I have ever encountered. I won't take my cats elsewhere if I can avoid it. The doctors go out of their way to help. Phenomenal people. No, I'm not a schill. I simply love that animal hospital.

That's a decision only the owner could make