I’m really sorry, Acorns. I had hoped this would be good news. Hugs.
Sorry to hear that 
But, it sounds like you’re making the right choice for his current situation.
Much sympathies.
I am really sorry to hear this Acorns. But I’ve been through the same situation. Just remember that you are doing this because you love your dog and want to free him from his pain. It’s hard to give up, but in the end I know in my heart you are doing the best thing for Sparky.