One more story of note from the past couple of months - Cai had suddenly started being hesitant on the teeter, and even jumped off in the middle at one point. A few weeks before that, he had been consistently popping out of the weave poles around the 10th pole. That's a common issue, but it appeared suddenly when he had never done it before.
I got him to the chiropractor, who reported that he indeed had a disc out of alignment again. Our next opportunity to do the teeter was two weeks later, and Cai was back to his usual form. In fact, Blancett told me to stop babying him at the drop and instead start running past and testing his contact behavior (4 on). He still popped out of the weave poles, unfortunately. Back to training!