I can attest to having a barking dog being an excellent deterrent. One night about a year ago, somebody was snooping around our backyard (we saw them on the security camera), one sharp bark (from the little dog no less, our bigger dog isn’t much of a barker) sent the snooper running.

I’ve long thought that this could / should be a simple home security system. Glad to see somebody did it and that it worked for them!