I have always wondered that also. And another thing, I would have taken the leash OFF the dog because he could have gotten it caught on something.
We had a wife murdered in our area. Hubby was involved with another woman and didn't want to pay child support or alimony. He made good bucks. His wife was in their van or truck and it went over a cliff (He didn't have the emergency break on). The problem.....He did it somewhere where they had never been on their usual Sunday breakfast trip. Breaking a pattern always causes a question mark.