Hi all, so Lucy is now almost 6 months old to catch everyone up she comes everyday with me to my security/pc shop where there are poeple that come and go throughout the day some she knows other she doesnt know. My issue is everytime someone walks in now it triggers a bark from Lucy and it's doesnt seem to be a happy your here bark but more like fear? or a warning? Some people depending on how she is approached example if the person gets down to her level she will aprroach and begin to play/interact with them if they stand there she will contunie to bark and back away almost scared. My other issue is when walking on a leash she now will bark at people walking by and lunge not saying she would be mean I dont think she would but maybe protecting me? I need some help to get this under control I wopuld like Lucy to be a healthy friendly dog that I can continue to bring to work with me?, any suggestions would be appreciated, is this common among this breed to be fearful at a certain age?