After grooming, I tacked him up and took him to the arena. I had just attached the lunge line when he squealed and reared up. I told him he should be embarrassed because he sounded like a mare and directed him to settle down, which he did. I think it is merely high spirits, but he has got to expand his emotional control skill set.
When we got to lunging, it was the usual at first – hard for him to stay in trot without much reminding and then much cavorting and carrying on when allowed to canter. The good news is that he is settling more quickly, which is actually a very good indication.