The Island Stallion

by Christina
(USA)

It's a sub-series to the Black Stallion (also a good one).

A boy, Steve and his friend go to an island no one cares about to camp and find a whole undiscovered lost world and the world's most perfect breed of horse, ancestors to the Spanish that lived on the island 400 years ago! Steve has a odd connection to the lead stallion he's never physically seen but always known.