Strangers often like me because they meet me when we are on my wanna go for a walk, and I am outside and very happy sniffing about.  When they meet me in my house, I am acting the hostess and I am very still, letting them pet me and adore me. Exhibit A

However, when we get behind closed doors and there are outside noises like car doors or truck engines that could be the mailman or man in brown - see Exhibit B below.  All bets are off and I become Cujo-like, very serious about watching the house.