Ah. An attack on the property! Got it! Five (or maybe ten) minutes with Tyson and I could tell you more about his history.
Obviously, he had a rough go of it for a while, and fear was how he stayed alive. He will be an awesome protector for you, for sure.
Is he barking at those people to scare them? Or to tell them “Hello, and why has it been so long since you came to visit?”
I think fear. He stops barking at the respite care provider as soon as the door is opened and he sees her.
Not so much that as fear of losing his place. He has a very good gig!