We all have different levels of coping with our pet's death. My son had a similar experience, in fact, the same deadly disease. His dog was just a little older than your Fuzzy. He absolutely adored his dog, Hutch, and when he had to make the decision to put him down, he could not bear it. I totally understood as he was my little boy who tried to rescue birds that hit the window and gave them mouth-to-beak resuscitation. He just couldn't be with him and feel that he put an end to his life. I think we all have to do what is best for us - and it takes nothing at all away from your dog's love for you - or my son's dog's love for him. We all just deal with this issue differently. Fuzzy would not want you to feel guilt or dismay - he had a good life with you so please, forgive yourself. There truly is nothing to forgive. You did the right thing by ending his suffering. That is what is important. If you love him, let him go so to speak, but know he will always, always, always be a part of you no matter how his life ended. Sending virtual hugs. I am so sorry for your loss as well.