In THIS CASE, the smaller the ground surface of the shoe, the better.
I would have just put a tennis ball on the bottom of his foot if I thought it would help more. So if the size is what you are getting at, I hope it answers your question.
If not, then what IS the point? .
Good evening Patty! I hope your having a fabulous Saturday evening.
My point is the same as always. The shoe mimics the undressed hoof. The shoe is much wider and rounder through the toe and toe quarters than need be. Also, you being good at making handmade shoes could've fashioned a shoe which would have reduced leverage where he wants to breakover much more than what you did!
Thank You for your time. I'm sorry to hear your rocking chair broke!
Eric