I have the same problem with Tango kinda but she is only like that with bearded people and my dads friend came from BC to visit us and of course he had to have a beard. Anyway we told him to feed her take her for walks and give her treats but it didn't work. She wouldn't take the treat from him, she wouldn't eat and normally she loves going for walks but when he tried to take her she sat at the front door and wouldn't move. When he was sitting on the couch and even moved his hand she would bark and she wouldn't stop. We tried something that no body else had told us to do and that was to let Tango sleep in the same room with him (we also put Echo in there so Tango would feel a little more confident) and she slept with him for 5 days and by the next morning she wasn't barking at him but she still didn't want him to feed her so she kept sleeping in his room and on about the 8th day she was letting him touch her and feed her, she even let him walk her When he left to go back home she was sad and cried for the first night, but then she was back to her normal self the next morning! This doesn't work with all dogs though.