Spirit

Spirit is a Kiger Mustang from The Movie Spirit: Stallion of the Cimarron.

http://images1.wikia.nocookie.net/parody/images/c/c8/Spirit-Stallion-of-the-Cimarron-spirit-stallion-of-the-cimarron-12474676-780-436.jpg

Spirit played Buck in Home on the Animated Range Edit
He is a Horse