Unfortunately, I’m not much of a dog person.

The house-cleaner for the airbnb next door has a little yappy dog which she brings to work and sometimes leaves inside her car for 4-5 hours at a time. It barks at me every time I step outside my door. One day I got so fed up with it that I found a Youtube video of a dog barking and played it loudly for an hour. Ironically, this generated a complaint to me from a neighbour who is my good friend. So I won’t be able to do that again. Funny that the actual dog barking didn’t bother anyone. But a recording of a dog barking has people up in arms. You can turn a recording off in an instant. There’s no turning off a real dog barking. Next time she leaves her dog in the car for 5 hours on a hot day, I will call the police. I don’t understand why anyone would bring their dog to work (with the exception of service dogs of course). Especially when working right beside other houses where the dog is not a familiar visitor.

I’m in Canada, so an armed guard or “protected by Smith & Wesson” would be exceedingly strange. Regular people don’t generally walk around with guns here. Farmers, hunters, police and criminals have guns here. No one else does. Hand guns are illegal. I grew up on a farm in Ontario and we had a .22 and I’ve also seen and used a .22 at friends’ houses growing up. Mostly just target practice, but occasionally we shot ground hogs. Otherwise, I’ve never seen a gun (except in the movies and on TV). Canadians just don’t carry guns.

The owner of the airbnb hotel beside me is in fact an RCMP officer. So he’ll have a gun. Lol! You’d think he might also have some interest in obeying the laws of the land. But he’s unapologetically flouting the law. Go figure.

But lots of good suggestions in your responses. Thank you for the support.

Addressing the bigger problem you can take several approaches.

Find an attorney. Get your other neighbor(s) involved to share expenses and start keeping a log book of all incidents, police calls, safety violations, thefts, noise issues, and parking issues. Date, photo, and describe each incident and ask your neighbors to do the same. Logs like this are legally admissable in court. Get the attorney to start sending some letters of cease and desist.
Search for other folks in your town that are in a similar predicament.
Get an assessment on your property to see if the “hotel” next door has devalued your property.
Find out your local trespassing laws and signage. Post appropriate signs with “no trespassing” or “private property” or if you’re up for it “protected by Smith & Wesson.”
Hire (with your neighborhood) a security service to patrol the illegal parking. If your state allows security gards to be armed get one of those. If you sue for damages you might be able to recover this. Also have the security service take photos of guest cars and license plates consipicuously. Any services that block your driveway call and complain. Document and if it keeps happening get that attorney to send them a letter.
Find your local state representative. Make an appointment and visit their office, in person, with your neighborhood group and make sure to tell your local news about the appointment; invite a news photographer and writer to go with you. Bring photos and your log books. Ask that the law be upheld and lobby for stricter sublet laws. Ask specifically that your Airbnb neighbor be stopped. Reps are incredibly responsive to visits, especially one made so public.
Borrow a large unfriendly barking dog; or if you’re into it, get a large unfriendly barking dog; there are many rescue groups that you can foster a dog. Take the dog with you when confronting the guests, owner, or folks blocking your drive.

Sadly getting this fixed will take a lot of work on your part.