Lyle, I know exactly how you feel. Eight years ago we decided to get a cat and we were shopping at Home Hardware and there was a vet right next door. We saw a picture posted in the window, cat for adoption. We went in and it was a cute black and white female, and we found that the vet had already spayed it, so we brought it home.
I got really attached to it and it was so friendly but I never in my life saw a cat that was so hungry all the time, it even ate popcorn, Anyway, a few months later the cat was losing so much weight but eating like a pig so we took it back to the vet and it cost us $800 to have tests done and we found out that she had FIP's. (That is Feline Intestenal Peritonitis.......This is something there is no cure for and she kept losing weight till she was just bones so we had to have her put to sleep. It was so very sad because they can't tell you what is wrong.
What made us angry is that we think the vet should have waived that cost because he should have known the cat was sick.
Anyway, that is my sad cat story. We now have a male Bengal and a female mutt and love them both dearly.
http://en.wikipedia.org/wiki/Feline_inf ... eritonitis