Sounds like you’re dog was reincarnated into your son
🥺I lost my dog that I've had for literally half my entire life a few months before my son was born. I was heartbroken. I know she would've loved to cuddle with him and eat all the food he throws on the floor and lick his face and hands after he eats. She was a spoiled girl and I was sooo looking forward to her eating my baby. She was 14 and my first "child".
I haven't had that happen to me but having 6 pets with wildly different personalities, I think your dog would have definitely been jealous and protective of grandpa 😆. We are the only ones who know ours pets the best so im sure I would have happened the way you imagined or even better. One of my cats gets jealous when I have my daughter and vice versa it's adorably annoying 😂