A Horse to Treasure by Juliana Hutchings is a lovely story for young horse lovers, and is the second book in the series.
Hilary is the owner of a young horse named Promise and is training him to show in Hunter Jumper events. She is also a riding instructor and the story includes educational insight to beginner and more advanced training.
The teen social life weaves in with the horse show prep and events. When someone wants to buy the Promise, Hilary has a choice to make about her and the horse's future.