Wow, Ellie, this is just strange. You must be ready to lose it some more. At least some things have been eliminated. I'm surprised it isn't arthritis. I always marvel at how well dogs hide their pain. Do you suppose he's been hiding it and he could no longer keep it a secret. Meaning, it could be arthritis?? I'm not a doctor of course.
I'm glad he's on the antibiotics and I hope this does some good. This is exhausing isn't it? Poor little guy and poor Mom.

Your vet is awesome!! I have a fabulous vet team but they want their money no matter what.

I'll keep you both in my thoughts and prayers and look forward to hearing that Sparky is mending nicely. Did she suggest some Rimadyl or somthing else for pain?