Just been catching bits of this at the pages at the end..and I kind of chuckled,wondered where the "bye-bye" came from.
We don't say let's go "bye-bye"...Cause I'm pretty sure Earnhardt knows how to spell the word "truck",so we don't even say the word.
He knows,as soon as he see's his harness,the back end of the truck is opened long before he sees the truck,or the harness.
He gets harnessed,we open the doors of the house,with no leash,he just automatically goes to the truck,sits in place to get buckled in.
He only wears a harness in public,so he associates that with going for a ride.