His Sense of Humour is Developing

So last night I was doing dishes, Justin came in to "help". I asked him instead to let the dog in the house.

Off he toddled. I hear him at the back door (just like two steps away). Sassy coming? Sassy he yells. Then I hear the door open, then a giggle as the door shuts.
Sassy coming? He giggles. I hear the door open, I poke my head around the corner asking if he needs help only to see a boyo closing a door carefully just as Sassy tries to get in the house. He did this again. Sassy was being very patient.

I said "Justin are you teasing the dog?" He looked up at me and chortled.

I opened the door and let the dog in. :)

Told Jim about it. His response... He must have learned it from his mommy who likes teasing her animals too. :)