Hippotherapy
The American Hippotherapy Association
Read about hippotherapy here
http://www.americanequestrian.com/hippotherapy.htm
Hippotherapy for C.P.
From the site:
...today’s therapeutic options for youngsters with CP offer up the kind of thrills and adventure that any child would remember for a lifetime... Thanks to this equestrian form of therapy, some children have even learned how to walk.
http://www.cerebralpalsy.org/treatments/hippotherapy/
Hippotherapy for Autism
http://autism.about.com/od/alternativetreatmens/f/ridingtherapy.htm
Find a list of therapists here