When this woman is feeling uncomfortable about her neighbor, she asks Reddit:
New to reddit, please forgive mistakes. I (337F) live alone in a pet friendly, no breed restrictions, apartment building (renting) in a US city that has significant crime. Our building has 2 on the 1st floor, 2 on the 2nd floor, 1 on the 3rd.
I live on the 3rd floor. I don't share a landing with any of my neighbors and anyone coming up to the third floor is coming there for me. We do not have a secured gate or a front door to the building.
I have a 40lb dog, not aggressive in the slightest, does not have leash aggression, does not resource guard. She does have ONE guarding tendency, and due to where I live alone, I fostered this: she will bark at the door when someone is outside. She is part hunting hound so she has a very big, vocal howl-bark.