Dogs don't realize it. . . and love to hang their head out moving vehicles, especially when riding in the truck box. . .
A friends dog lost an eye that way. Vets see many happenings and warn owners about it.
Let ur friends know!
Thanks for your reply. This is our 3rd. E.S.S. and none of them have had door windows down far enough as to allow them to put their heads outside. The 2 shots of him looking out the window was while the truck was parked. Still a good point to pass along to friends with dogs.