So sorry for your loss of a dear furry friend. My heart breaks for you as my husband and I had to do this with our little poodle. It is hard to see them suffer and it was selfish on our part to let go but you did the right thing for your doggie. Just go back and enjoy the fun times and lots of memories. I know you have a part of your heart broken and I am sure you did everything possible. Deepest sympathy go out to you.