I spoke to the vet a few minutes ago. He said Alexander's condition was untreatable, and we agreed to have him put to sleep.
I want to thank all of you who e-mailed me best wishes for him.
Before I spoke to the vet, I e-mailed the people who won copies of the audiobook. Those people who need to send me their addresses should. I anticipate spending the rest of today sobbing, since that seems to be all I'm capable of doing right now, but I'll try to get to the post office before leaving for ALA on Saturday.