I didn't want to post
when I originally read your post about Jack not eating. Only because the same thing happened to my 8 yr old girl, her diagnosis was lymphoma. I was fearful Jack had something other than an infection. But you did what needed to be done. Now Jack is at peace with no suffering. He's eating and drinking and running and playing at the Bridge as he did when he was a young and spry pup!
I too had to make that ultimate decision. And I know in my heart my Blizzy is not angry that I did what I did. I believe she thanks me for ending her suffering. Take solice in knowing, you did what you did because you LOVE him so much. Soft hugs to you. I am sure my Blizzy and all the wonderful furbabies who went before Jack were waiting at the gate of the Bridge to welcome him home.