[PaulJ]

I don't know the whole story, but my guess would be the girl got home from school, walked home with the dog and gave it some goody to eat. He's just repeating the behavior that was ingrained in him.

[MonroeDNA]

Dude, dogs certainly have emotions. They get jealous, get sad, and get happy.

Does your dog behave the same if you have been away for a day, or been away for a week?

Does your wife?