A pregnant mare, riding lessons, a horse show, and a cattle roundup prove challenging for all.
Amy and Lou take in an elderly neighbor's pony and Ty's old girlfriend from the juvenile group home shows up looking for him.
Prize-winning rider Nick Harwell stops by Heartland. Mallory discovers a crooked ranch-hand who plans to sell a herd of wild mustangs to a slaughterhouse.
A famous racehorse comes to Heartland for healing, which brings some unwanted media attention.
