I know I don't post very often but was just curious, how long have you had the new neighbors? When I had my adult Dobe she would bark at the new neighbors till she was used to them, she even got to the point where she recognized his family members and didn't bark at them, but strangers she would. Dobes tend to protect what they see, is there a chance maybe your neighbor would come to the fence and meet the dogs, maybe even give them a cookie if they sit so they will know she belongs there, or is she not really the kind of person you can work with? Love the pic, behind the fence LOL!