I'm so sorry to hear about your baby. I can feel your pain, as my 7 year old Chewy is in the hospital right now with pancreatitis and kidney problems. His future right now is unknown, but I'm trying my best to stay on the positive side. Here's a prayer that I found that you can say for your dog:
Heavenly Father:
You created all things for your glory
and made us stewards of this creature
If it is your will, restore it to health and strength
Blessed are you, Lord God,
and holy is your name forever and ever. Amen