We had visitors over a few times, and my jaw almost hit the ground upon seeing how relaxed Hachi was. One time, he fell asleep within about 10' of a stranger while on the deck. Another time, he was friendly toward a person who Hachi was very afraid of when he was younger.
I think that a lot of play is a big part of it. He and Shyla get to play together every day now.
The Runner and I also have play sessions with Hachi. We have continued his "play therapy" which involves at least one play session with a human every day. When we first started staying at our new place, he wasn't interested in playing with us humans. The reason was undoubtedly that he was nervous in the new house. Now he wants to play which is wonderful.
Whatever the reasons for his blossoming, I am so overjoyed about Hachi. On several occasions this week, I exclaimed that he seemed like a normal dog. Imagine that! Wow.
Now is the time to remind myself that rehabilitating a dog like Hachi is a roller coaster ride. I'm sure that the ride will continue but, for now, I am so happy for him and about him.