Watching how the doggy is reacting to one of my brothers staying over at my house. There hasn't been any overnight visitors since over a year ago when I got him. He's fine with him until he goes upstairs and then he'll go into the spare room up there, check him out, run out, go back, growl, jump on the bed, sniff, sniff, jump off, run out, growl and repeat.
He's guarding the stairs right now while he's taking a shower, lol.