Puppy barking at other people/dogs
My 13 week old chihuahua puppy Dudley is picking up the bad habit of barking at other people and dogs outside. We live in a pet friendly apartment complex so whenever he is outside using the bathroom or going for walks he basically barks at everything that walks by. How do we get this behavior to stop? He's been socialized pretty well, has gone to several cookouts and other events with a lot of people, has played with 3 family members dogs and goes on daily walks where he is exposed to other people and other dogs. Please help make this bad behavior stop. Thank you.