I recently posted a blog about a dog in the back of a truck, and I found this other photo I had taken of another dog riding down the highway in another truck this time without a tailgate. We were going in the same direction so I was able to observe the dog and he seems to be enjoying the ride and staying away from the open tailgate. Most of these trucks and dogs live on a farm or ranch and they are usually quite large in Texas. So putting the dog in the back of the truck to drive a few miles across a ranch is not a big deal. Happens all the time. So, I can see the ease of making the transition to the open highways where speeds exceed 75 mph.
I have seen many dead dogs on the side of our highways and wondered how they got there... Now I know.