Ask HN: Does your dog have a theory of mind?

Recently my dog has found a new level trick to get the playing going. He basically goes to another part of the house pushes that door closed and waits behind it until we discover him. All while making sounds, peaking behind the door, closing and opening it again and again. This is 100% playful behavior but on Google I only find explanation of anxiety and stress related causes. I hesitate to interpret this as intelligent behavior and project a theory of mind on it but it sure is a nice surprise.