We had another group over for a visit, and I think that it proved to be too much for Hachi. A big part of him wants to meet people and new dogs but then he gets scared. His fearful outbursts can scare everyone around him, which can start a spiral. All that we can do is keep on learning. When more than 2 people come to the house, Hachi needs way more space than we tend to think that he needs. We'll get it right next time.
Hachi bounces back fast after each stress (like visitors). He danced with his sister after one!
All in all, Hachi had a great week. He has a lot of joy in his life, and he brings us lots of joy. Happiness all around.