Thanks All! Elwood is home and resting, er, whining, in his crate. I had the donut and it didn't work well for him, and he chewed through 2 T shirts yesterday.
So for now he is stuck with the cone of shame. I might run by the kids' resale shop tomorrow and get a couple of more shirts. I think in a few days I might be able to let him outside in one. She was hoping to just cauterize it off, but when she got into it found a couple of big blood vessels that were feeding it (which explains why it grew so quickly). So she had to put in some sub-q sutures and skin staples, which means I have to keep him from trying to pull out the staples for the next 2 weeks.