I kept my little dog alive for another 6 weeks, but I know exactly how you feel...and today we put her to sleep. It's something I consider to be the hardest thing in my life I've ever done. I'm 51, done a lot of things in this life, seen a lot of death...this was the toughest. I truly believe that sometimes we keep our pet alive for ourselves more than it is for them. If you can power through your emotional attachment, you probably know that putting your friend down is the right thing to do. Not the easiest, damnit, I just did this 2 hrs ago and I'm incredibly, deeply in a state of sadness...but my brain knows it was the only thing to do and I needed to be strong and do it for that little life. That little life that made us all so happy for 12 1/2 years.