The dog I had over 30 years ago when my first son was born was always with me, I thought would be super jealous etc.
When I brought the baby back from hospital hubby held him while I gave great attention to the dog and then took the baby in my arms and allowed the dog to lick the crown of bub's head.
Dog from that moment on bonded to us both. I made sure that nothing changed in the way the dog was treated, time outside/inside etc.
You may be very well surprised.
Any changes to routine etc that you think may happen...implement them now.