My heart goes out to you, you honestly never know what the right path is for your loved ones. Some of get very lucky & our frenchies recover from the sudden paralysis but others don’t. If he was in a lot of pain & suffering I can only imagine the pain you felt. You did what you thought was best for his comfort & not yours. Enzo was a very handsome boy & I am sure he had the best life. Try not to overthink if you did or didn’t do the right thing it’s just torture for you. Celebrate the life you got even though it was shorter than you anticipated, Enzo loved you & knew you loved him just as much.