hmmm, a doorbell which sounds with a large dog barking would be a great invention, with some wireless speakers and having the sound move around to the different speakers. .

I am starting a small home sound development company, any investors?

I'm afraid you're too late, it already exists. In fact there's one that the "dog" barks more the closer you get to the door

What about when the Publisher's Clearinghouse guy shows up?

No, there has to be threat of bodily harm. Your front door public access, if they come straight to front door and knock. You have choice not to answer or tell them you’re not interested and say by. IMO way I read Florida law does not give you right to just shoot someone, there has to be deadly threat. IMO threading to shoot someone knocking on front door threat. Recent case in Ocala good example.

A quick google search

Stand-your-ground laws
Also known as "line in the sand" or "no duty to retreat" laws, these laws allow people to use deadly force in some cases of self-defense outside the home. The force must be proportional to the threat of death and the person must have a legal right to be at the location. As of January 1, 2024, 35 states had stand-your-ground laws.

Castle doctrine
This common law principle removes the duty to retreat when someone is in their home, and sometimes in their workplace, vehicle, or yard. The castle doctrine presumes an imminent threat of death or harm, and allows the use of lethal force against an intruder.

Actually, a camera doorbell (Ring, etc.) will also discourage scammers as they don't want to be recorded at your door.

Please stop saying things like this. Someone might think that it is true and actually do it.

I received a phone call from a similar group. No, no, no...and I hung up.