The dog barking is a great idea, this is a little different than a voice announcement that uses HE's voice engine. Do you just have a sound file of a barking dog?
There are other ways to do it, for example, having Alexa devices produce the sound. In my case, Killer Dog barking is done by a Wyze doorbell chime.
Its basically a fan so sound is the same, just different pitches and volume. Turning on is either high or low but you can turn the top to change the pitch. If you have a BBBY locally they have them on display to listen to.
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I use this white noise machine:
Currently described as the “budget” model. But that’s a good thing since it’s just a dumb on/off button that lends itself to automation with a smart outlet.