I'm sorry but that is just TOO cute!!! I love their little barks.
I have no idea what you could do for that... I guess it would scare some people, annoy them or make them question your dog.
My fur baby barks at people.... when shes around me... I wish she wouldn't do it. I know she's protecting me, I've got to work on her barking.
But she barks at other dogs when they ignore her and she wants to play... she even barks at my cats!
I don't know what to tell you but if I saw Milu and she was barking at me I'd give her tons of pets! Who could resist a face like that. Oh yeah that jerk! BOO!
He doesn't know what he's missing.
Good luck finding a solution though!