Well, apparently it isn't such good news after all. We took him to our vet because he wanted to see him, and no sooner did we get there and his stomach got all weird shaped and went rock hard. He has a huge mass on his spleen, and probably a bunch of little ones in other places and it's affecting his kidneys. The only advice our vet could give us is to "take him home and keep him content and happy"... that's never what you want to hear. Basically, surgery is way too risky and would do no good anyway as he has other ones around too and it would be impossible to get them all.