I have had my rescue dog since she was 6 months old and she is now 2. In many ways she is a lovely dog but she barks aggressively at strangers coming into the house, always at the postman whether he is delivering the mail or if we meet him in the street and very occasionally at some people when we are out walking.
She is my first dog and I am at a complete loss as to what I am doing wrong. Please help!