We finished up our rehabilitative play course, and I learned so much. Hachi loves to play and so do I. It does seem to "lighten" Hachi's attitude toward unexpected happenings so he can think.
The only "not-so-good" aspect of the past couple of weeks has been that R has accidentally wandered straight into the side of Hachi's ex pen a couple of times. It's totally due to his blindness. R gets flustered, and Hachi gets scared. I think that we've mostly solved it with a guiding runner carpet to lead R past the ex pen.
This morning, Hachi went with me for a sunrise fat bike ride. It was super cold and windy but we played a bit. Hachi glows so brightly in the sunrise light!
I had to keep him moving so that he didn't get too cold (meanwhile my fingers were turning into blocks of ice).