I asked that they send it for biopsy. Stage I mast cell tumor.
The vet knew a vet at the U, and we quickly had an appointment for October. Within an hour, they called with a cancellation for September 26. We took it.
They took half his ear, and it had advanced to Stage II.
Stitches are out and he has a clean bill of health. although I suspect he has some self-esteem issues.
University of Minnesota, thank you for my dog.