One group to contact by mail, phone, or email is a horse rescue near me called
Hooved Animal Rescue & Protection Society. I get their newsletter/magazine -- they are terrific! "The Hooved Animal Rescue & Protection Society, (HARPS) is a 501(c)3 not-for-profit organization that was founded in 2001 by Donna Ewing, one of the nation's best-known and respected rescuers of abused and neglected horses and other hooved animals."
HARPS has also been involved with Equine Education including this --
"A very exciting aspect of our educational focus is the involvement of at-risk children in the hooved animal protection effort. The rehabilitation success we have experienced with animals in near death condition, brought back to vibrant health with proper care, is an inspirational experience for children during their own rehabilitation. Visits to our facility can offer real hope and a powerful visual representation that loving care and understanding, diligent work, and the unselfish help of others can bring about remarkable change."