Walter Farley (June 26, 1915 to October 16, 1989) wrote The Black Stallion (1941), which was an immensely popular children's book. He wrote many more and here is a publisher's blurb (found on books.google.com) for The Island Stallion (1948):
When Steve Duncan is asked to go on an archeological search on a remote Caribbean island, he never imagines the stallion he will find there. But the giant horse is unapproachable, showing nothing but fear and fury towards people. When the stallion gets caught in quicksand, can Steve get close enough to save the wild horse?
And we read somewhere that while his own four children were growing up, "Horses, cats and dogs were always part of the household."