We never used to worry about Shio running out the front door into the street. Was it because we're bad dog owners? Nope. It's because he would have to run out the front door, down the hallway, wait for the elevator, ride the elevator to the lobby, run out the building's front door and then get to the street. In case you're wondering, yes, potty training was very difficult! Now that we moved and have a front door that leads to the street we are very careful about teaching Shio sit-stay before charging out the door. In this new place, we also gained an unfenced back yard. This would've been a dream if we had an area dedicated for Shio to run around in but we've been training him not to run out when the door is open to the back because it's not fenced. He's not allowed to run out for squirrels, birds or even a toy that accidentally rolls out the door.
We have neighbors that live upstairs and often here them walking around their hardwood floors. Shio is slowly adjusting to the sounds although he does have his freak out moments where he goes into a barking fit if he hears our neighbor's door slam shut. Every once in a while, he can hear voices upstairs and has been on edge about that.
We also have the mail man, UPS/USPS/FedEx package deliveries that come through our front door. We had the luxury of a doorman accepting all of this for us previously but now we're on our own. So far, Shio hates all of them.
On the up side, we've made a new Shiba 8 month old friend name Boozer from the dog run. They play and fight like brothers! They also dig like Shibas and have created many ditches in the dog run in their attempts to get back to save their friends in Japan.