Oh, Sue, I'm so sorry. I know the news must have been very devestating. I honestly believe you made the right choice. I also wanted to let you know that when I first brought home my shepherd/collie mix and weighed her, she only weighed 40 pounds (yes, she was full grown).
Anyway, Killi, keep eating what you can when you can. I'm sending you lots of hugs, kisses and scratches. Keep fighting. You are one strong boy!!!