What should I do if a dog won’t stop barking at night?

Did you ask the client about their regular routine? Sounds like the dog wants to go out in the middle of the night since he keeps going downstairs. I always ask about their daily routine. I know it's very hard and frustrating to be in a situation you are in. The best way is to ask the client and tell him the dog is barking at 3am and wants to go downstairs, is that a normal thing, do they go out at night? Does the client work days or nights and have a different routine? Those are the questions to ask. Unfortunately there's not much you can do and you have to wait it out. Most of us have been in this situation. I had to stop boarding dogs/house sitting for this exact reason. After few years I had to quit these services.

So sorry you're not able to sleep! I've had this happen too many times. I recommend that you reach out to the family for advice, definitely play calming music in the main floor area or in your room, wear earplugs. Good luck!

If you own any Echo devices, try brown noise!! - and noise cancelling headphones…..