Maybe you guys need to up your hot sauce game. If you're using hot sauce you would eat yourself why wouldn't a dog like it? We're talking about an animal that will eat used kotex and diapers.
You could try this although it is a little pricey.
https://www.amazon.com/Source-Sauce-.../dp/B001BIXJG2
My kid gave me some years ago, I still have some of it. 1 drop will ruin a gallon of chile verde if you're not careful.
And maybe only use it on the bad neighbor's dog, not your own. Better yet, use it on the neighbor himself.