Right Back at Ya

A little dog sits on the front porch looking out at the street.
A boy rides his bike past the house, again and again, each time sticking his tongue out at the little dog.
The dog seems to be watching the boy and follows the bike back and forth without making a peep. Finally, the boy stops, gets off his bike, and calls the dog to him.
The little dog turns away from the boy, then looks directly at him, and very slowly pushes his tongue out of his mouth until it is visible to the boy.
The boy gets back on his bike and rides away.