The problem with dog doors is that they also double as baby doors, and while it would be nice if your baby could go outside and take a dump in the grass instead of in an expensive diaper, but people generally don't want their children running out into the wild on their own. That's how you end up with a dingo eating your baby. Luckily the dingo next to the baby here just wants to go outside too, not eat him.
I think these two are going to learn a brutal lesson in stubbornness. Dogs and babies are both very stubborn. I don't know who is going to win this battle of wills, but I'm going to guess it'll be the baby. Dogs know better than to win over a baby. Dogs get hit with the newspaper. Babies don't.