Peggy is Rory’s replacement as Black Beauty’s partner when Black Beauty works as a job-horse. She’s a pretty mare, but she’s not as tall as her peers. This, she explains, means that she can’t go as fast, and men whipping her to keep up with a long-legged carriage partner has caused her to develop an annoying and unattractive habit of inserting a canter stride every few steps to keep up. Because of her gentleness, ladies eventually purchase her—they want a safe horse, not a fast one.