We have a 4 year old Jack Russell !$#!#, who is very nervous of strangers. When we have people coming to the house who she does not know, she will bark continuously and remain upstairs. I would love for her to feel comfortable with strangers. I tell people not to look at her or talk to her and tell people she is nervous of strangers, but they still try and talk to her, which makes her worse. Any advise would be greatly appreciated.