Ugh. The fact that you begin to obsess over solutions such as this indicates that you've been driven over the top. It really is a terrible problem. My last house I couldn’t get from my car to my front door without triggering a spasm of barking from behind a six foot privacy fence that went on forever. I finally outlived the problem. The owner and believe it or not, the dog, both died within 6 months of each other. My reaction was muted.