I have to agree with king2005. I don't necesarily think this is cruel to the dog. Lazy, sure. But if the dog was trained to run beside the car, and knew what to do ... not confused and dashing about where it might be injured ... well, the dog was probably enjoying the run.

I wouldn't personally do it, but I see a lot of people here driving slowly down dirt roads in the desert, letting their dog run beside the truck. I've never seen anyone have one on a leash, though.

As for how safely he was driving, it depends on where he was driving. If there was no one else around for miles, and he was on a country dirt road, he probably wasn't really driving recklessly or endangering anyone. Probably a lot safer than people speeding down the highway, texting on a cell phone.