My family has four dogs and our backyard has smelled quite treacherous, at times. We use Simple Green Outdoor Odor Eliminator on the ground and it works pretty well. It has a nice smell that lasts a few days, even after they "go" on it again. I imagine that you could give it to your neighbor to treat their concrete. It might also help if you sprayed it on your side of the lawn to mask the smell. I hope this helps!
Q