Yes, I’m concerned about leaving Kiah alone in the car, not so much in the hotel or B&B. I take some basic precautions:
1. Park the car next to a wall, or trees, somewhere shaded, and back in so that the dog is less visible in the back.
2. I make sure Kiah is in the back of the car, not sitting in the front driver’s seat – not that I think she’ll drive away, just that she’s less visible in the back. Makes it easier that she’s a 75lb Lab, and far less likely to scramble over into the front seat than, say, a Schnauzer. Maybe put a barrier up between the back and front seats if your dog is likely to jump across.
3. Open all the windows about 2 inches. Creates a wind flow, but not enough room for a hand to get in and get to the door locks.

As for the hotel/B&B:
1. When Kiah was younger, I used a lightweight, fold-down travel crate in rooms. Dog is secure and safe, owner can enjoy food, romantic liaison, shopping:)
2. Now Kiah is more mature, I simply make sure her bed (she sits on it in the car; I take it in to the room)is comfortable, she has water (not food – possible bathroom needs), and has a chew toy to keep her occupied. Basically, I think she just sleeps:)
3. I try not to leave her alone very long, say an hour at most.

I think you’re right to be concerned, and take precautions. But, at the same time, don’t worry about it too much and ruin your (and your dog’s) holiday:)

Have fun!

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