That sucks. I had to put my lab down last year when the vet found cancer. He was already out for exploratory surgery because he was having digestive problems so I told the vet to just not wake him up. That dog went to hell and back with me and he was literally there by my side for some tough times. Next to loosing my brother I don't think I've been that upset over loosing anyone. They are family members that's for sure.