We’ve had our gsd puppy since he was 9 weeks old. He is now 5.5 months old and around 55lbs. He’s proved to be pretty fearless in many situations. He’s always been extremely friendly with people and other dogs. Is always thrilled to have attention from people and is super playful with other dogs but as of a couple of weeks ago he has become reactive on walks in our neighborhood. Anytime he sees people walking their dogs or coming out of their homes he stops in his tracks and begins to bark. It’s difficult to pull him away. He’s also begun barking when people ring the door bell or knock on our door but is extremely happy when visitors walk in. It’s strange because if we take him to the park or if we’re out at shopping centers/in parking lots he is not reactive at all and is very relaxed, it’s literally only in our neighborhood. It’s embarrassing and nerve wracking because we can’t control the environment and I feel like people assume that a barking dog is an aggressive dog and we don’t want problems when he reaches 80-90lbs in a few short months. A little background information I guess is that our neighborhood is very quiet and not many people are out all of the time (people are out walking way more now with the social distancing/stay at home). Is it because he gets spooked that we’re outside alone and then suddenly people/dogs pop out of nowhere? Is he not spooked at shopping centers because there’s plenty of people and cars all over? Could it be frustration that he can’t just go up to dogs and people and sniff them out when he’d like? We noticed that if he has the chance to sniff out things/dogs/people he’s very friendly right away. Any training tips? Thank you in advance.