Express disgust towards Mr. Mellerstig for leaving the scene and putting his child in danger. Predict that he will engage in further reckless behavior.
Mr. Mellerstig has spent decades carrying. He wants to be a badass! If it wasn't this dog, it would be another, or a person. 
He is despicable, and leaving the scene is inexcusable - he wasn't traumatized, he just needed to get his story straight before the cops got there. His kid was in his car seat! How about just shutting the door?! This isn't the end for this guy, he will do something other stupid macho stunt, just wait.