I live in a three story apartment building.
Several months ago after I dumped trash, checked mail in the evening, I happened to glance up to the second floor from the patio. (I live on the second floor.) I saw what looked like a Pit Bull running loose up there.
But I had to get to my apartment. So took the elevator and got off. Started down the hallway to my apartment. Lo and behold, I heard paws padding behind me. I didn't look...just kept going. The dog passed me by.
But when I started to open my apartment door, he came up and put his nose to my door.... ready to go inside!!! I sweetly said "oh no, you can't come in". He then trotted off!!!
Found out the next day it was a neighbor's dog....he had run out the door. I have seen that neighbor walking his two dogs. One of them is shorter and stockier.... forgot the name... English something or other.
@Matthias