I am afraid that my two cats and one dog would get an award for being the "least protective!" When someone comes to the door, Andy, my white cat, heads to the basement before even seeing who is there. Trevor, my huge orange tabby, waits to see who it is. If he doesn't know them he heads down to the basement with Andy. Bella doesn't bark but her tail starts wagging so hard that her whole rear half is moving. If she doesn't know the person she backs up as they move forward, tail moving all the time! If she does know them....watch out for lots of slobbery kisses! As you can see, there's no protecting going on here!