I'm really enjoying this link, thanks!

I found it because a mefite emailed me about my cat Fred who died in 2005 - of the same thing, I think, that mudpuppie's cat recently passed away from. It's weird; I've gotten at this point like four emails over the years from people finding that askme - and it was a comment, too, not a question and I'll never find it again - in a desperate search for what happened with their cat. Here, finally, is the explanation. It is sad but clear and concisely written