This little fellow continues to amaze me. I don't know when or why this happened, but he has pretty much stopped his protective, aggressive behavior around Sofia and the rest of the horses.
Not completely, as he arched and squealed a couple of times when I rode Rusty near where he and Sofia were snoozing in the shade yesterday morning, but it was minor.
Then last evening I watched while Sofia and Prince grazed together in another part of the field from where Bo was grazing, rolling, and carrying on as a normal horse.
Sure is pleasant to see. Do I test this with some assumption that his behavior would generalize to other settings?