@Tamara170, I have a parrot, who can whistle, and if he is unhappy, he will shreek loudly and may even include an imitation of the fire alarm going off. At first, I tried to shut him down,which increased the problem.
I realised, that he has the role of a guardian, like dogs do, to watch out for danger and warn the partner. Unexplained noises seem dangerous and even seeing unresponsive guests through a glass door puts him on high alert.
It helps to present the guests to him, but no touching allowed. He likes people, who like him and talk to him through the glass door. But even after 200 guests, he still hates people, who hate animals or are afraid of them. I try to filter them out, to keep his stress level down. Without stress, he talks and sings, there is no doubt, what mood he is in.
I guess your dogs are like that and it’s not fair to strangle them with a collar, if they just do their protective duty and also want to socialize.
I would have dogs and guests meet, put pictures of the dogs in the listing to avoid people who are afraid of dogs. And explain calmly that they can’t go in, when a guest is in there. With my bird, I whispered, when I want to bring his sound level down. It worked and somehow he got the concept of stealth. If he wants to alert me to a very strange thing outside now, he does not cry out, but flies on my shoulder and whispers something.
Dogs are hunting animals, stealth should be much easier to train them to, than it is for a nousy bird living in loud groups in nature.