She explained that Speedy has less range of motion in his right hind leg. Over the years, he has successfully cheated by carrying that hind leg, his weaker one, slightly to the inside. As a result, that leg doesn't step as far underneath him. In the collected canter, the horse has to sit more deeply with that hind leg reaching even farther underneath his belly. Since Speedy doesn't use that inside right hind as well, the rhythm of the collected canter feels off.
With a show coming in less than two weeks though, I am being careful about not making him sore. Just because I want him to bend over and "touch his toes," it doesn't mean he can do it in one day.
There is always something to fix, isn't there?