While you want your dog to be mindful of intruders and potentially harmful strangers, you still want them to be able to distinguish the difference between them and an unexpected, friendly visitor.
Depending on your dog, there can be certain people that can trigger a reaction or anxiety so it is always best to understand the triggers and learn how to work with them so that they can be more comfortable around guests to your home.
If you happen to know that visitors are going to be stopping by, you can prepare in advance by making sure that the house is a calm environment for your dog once they arrive. Trying to run around and doing things at the last minute can end up bringing up the anxiety level in your dog.
Beeing comfortable with the guest
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If necessary, you can think about having your dog in another room for the visit or even during the time the guest comes through the door. From there, you can choose to introduce your dog slowly so that they are much more comfortable with the guest.
It is always a good idea to be as calm and positive as you possibly can with your dog so that he or she does not get the sense that there might be something wrong. Shouting at your dog or getting angry with them can actually make the anxiety or acting out even worse.