[Rachael1983]

Sometimes moving isn't an option. And I doubt that it would be reasonable to text the other owner when he's out and when he's in. And it doesn't necessarily have to be large dog to be aggressive.

I was an apartment dweller just until recently and now I live in a condo. But I still just can't let Emma out on a leash. First things first is that since you do have a puppy, you start training with you first.

1. Train him to stay behind/to the side of you when you open the door. You don't want him just darting out. When you are out, you give the all clear and come and proceed.
2. Train him to behave by focusing on you when other dogs are out, aggressive or not.
3. You stay calm.

I learned the techniques in a puppy training class. But I'm sure their are tutorials on how to do so on Youtube.

Others have also mentioned that you can keep your baby in your arms when you get out and to your destination but in my opinion that only is temporary especially if you're not consistent.