Its dead now lets move on..You cant really answer the question about mercy killing, till it happens to you..My grandpa died of bone cancer and he kept saying that we should just shoot him, to get it over with ,cause of the extreme pain he was suffering..But could we? legally? nope but deep in our hearts we wanted to, just to end the pain of a loved one..And no pain in this world can compare to the sight of a loved one suffering..so step back and think about it Del, it's easy to say all that stuff about a pet cause it dont talk but if they could they would probably tell you about the pain they are suffering too and would you still feel the same about keeping them alive...These are just my 2 cents, I dont mean to offend anybody..These are just based on my experiences..