I agree that all dogs should have tags. Mine have the kind that rivet onto the collar so they can't get lost.

I won't let mine ride in the back of my pick up either. I have an extra cab Toyota, but they're too big to ride there sometimes so I strap carriers into the back and make sure they are secure.

If the dogs don't have any tags at all, it makes it very hard to track down the owners. Your best hope would be a shelter, preferably a no-kill. We have only one here and they will hold lost dogs if they seem to really be lost and not abandoned.

Mary