OMG. I saw exactly that scene last week at Home Depot. We stopped there after early church when the store had just opened and the parking lot was fairly empty. A white truck stopped down the row from me where I was waiting for my husband to come back. As the drive hopped out and headed to the store, two Chesapeake Bay Retrievers stood up in unison and fixed their eyes in the direction their owner had disappeared. They stood there for a while at full attention.
Finally, the older one disappeard from view when he sat down to rest, and the younger one followed suit. About that time another white truck pulled into the space next to the truck with the dogs. The driver started to get out of his truck, and the two Chessies jumped up and started barking furiously. The new driver quickly retreated back into his cab and moved his truck down by me. He caught my eye and looked a little sheepish and went into the store shaking his head. The Chessies remained on alert until the stranger was out of sight, and then they sat down again. It was pretty funny.
We don’t see dogs riding in the beds of pick ups often around here. I’m sure the 2nd driver was startled.