True Patriot
Sanity is subjective
Something I didn't see in the replies is the use of video cameras. While they won't help stop the dog or talk to the neighbor for you. They will document anything that happens. I sincerely hope that this can be resolved with a simple conversation for you. But having concrete evidence if further action is necessary will give you more than just your say so if animal control or other legal action is needed. Best of luck.