They bark almost all the time, especially when I am in the back yard.
I used to use a siren when they did that, but other neighbors complained lol.
Now I have a radio by the fence and a plug by my back door and when they bark I plug in the radio full blast.
That works pretty good, and I leave it on long after they stop barking.
I hope you have it tuned to KSFO AM 560!!! (grin)