They're not stupid. In fact, that dog is likely smarter than you both. He's just wondering when play will start. Depresses me that chavvy morons like this are allowed to own dogs, let alone one that could beat them at chess by accident.
Try using an actor the dog doesn't know. This whole thing is fake. Dog is released after friend is safely in shed. Dog first runs in between fence and shed to identify scent. Alerts family that retarded family friend is in the shed.
GOD loves you enough to send HIS only SON to save you and if you repent and turn from your sins and be baptized in THE NAME OF THE FATHER, THE SON and THE HOLY SPIRIT. ((if you haven't )