He got sad when we left him in the truck, but he was very good about waiting for us to return.
Lots of truckers I saw had dogs with them, and I know why. Percy was good company. Because he needed an occasional walk, he forced us to get some exercise at each stop. He was so interested in looking at everything along the way, he inspired us to be on the lookout for new things to see. He entertained us with his bedtime antics - trying to get his blankets just the way he liked them ... and he snuggled close to us on the bunk, which helped melt away the stress of the day.
Even after 5000 miles, when we got home and I asked Percy, "should we go for a ride?" he jumped right in the car, wagging his tail, ready for the next adventure.