Ok thanks. I might try that if he keeps putting his head low. Where could I get some DMSO? Is that like an ointment/ wound salve for pain/arthritis?
It's an antiinflammatory.
Try a feed store near you, or a pet shop.
https://www.tractorsupply.com/tsc/product/valhoma-dmso-99-pure-gel-formula-1-lb