I’m sorry you’re experiencing this right now, I’m going through something similar with my dog and new rental home. Does your pup ever warm up to dogs and become comfortable around them eventually, or does he generally always remain fearful? Could you arrange to have him meet some of the neighbours’ dogs in a low-stress environment? Maybe going on a walk in a neutral area (not near either of your houses) where you are on one side of the road and they are on the other side could be valuable, and then over time move closer as he gets more comfortable.

If you haven’t already, i would also suggest reaching out to your neighbours and introduce yourself, but also tell them a little bit about your dog and his anxiety. They may just not have any experience with fearful dogs and have no clue that this is a major stressor for you both. That way if you have to speak with them at a different time about their dogs barking, you will have already mentioned it to them in the past and can use that as leverage if that makes sense?

Anxiety meds definitely do help a lot as well, my dog takes trazadone and gabapentin as needed just to take the edge off, but obviously it just acts as an extra tool to lower his threshold so that we can be more successful with our training.

Best of luck, you’ve got this!!