I don’t remember them dragging a dog to death.
They obviously didn’t show it, that wouldn’t have been funny (but something they probably would have done if it was made today). Clark tied the dog to the back bumper for some reason, then later forgot about it and they drove off. He was stopped by the police, and all they showed was the leash…no dog.
https://www.youtube.com/watch?v=5HbBL62IiRE
I’m not going to claim that was funniest thing (although the end was pretty good).