Adler, C. S.
More Than A Horse (grades 5-8)

Bagnold, Enid
National Velvet (gr 5 & up)

Farley, Walter
The Black Stallion (gr 4 & up)
and many sequels

Haas, Jessir
Beware the Mare (gr 3-5)
and sequels
Uncle Daney's Way (gr 3-5)
Runaway Radish (gr 2-14)
Unbroken (gr 5-8)

Henry, Marguerite
Misty Of Chinocoteague (gr 4 & up)
King of the Wind (gr 4 & up)
Stormy, Misty's Foal (gr 4 & up)
and many other wonderful books

James, Will
Smoky the Cowhorse (gr 4 & up)

Keith, Harold
Chico and Dan (gr 4-6)

Nabb, Magdalen
The Enchanted horse (gr 3-6)

Rounds, Glen
The Blind Colt(gr 3-6)

Rayden, Hope
Wild Horse Summer (gr 5 & up)

Sewell, Anna
Black Beauty (gr 4 7 up)

Slade, Michael
Horses of Central Park (gr 4-6)

Springer, Nancy
Colt (gr 4-6)

Wallace, Bill
Beauty (gr 5-7)

Welch, Shelia K.
A Horse for All Seasons
(gr 4 & up)

Wilson, Diana
I Rode A Horse of Milk White Jade(gr 5-8)

Three fiction series of interest are Pony Pals by Jeanne Betancourt, Saddle Club by Bonnie Bryant, and the Wild Heart series by Laurie Halse Anderson which includes some horse entries.

Check the nonfiction shelves for terrific books about horses (J636.1) and horsemeanship (J798.23). the New Encyclopedia of the Horse by E. H. Edwards is the Main Collection upstairs.