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Mesohippus (meaning "middle horse") is an extinct, dog-sized, three-toed horse. It was about 4 feet (1.2 m) long and was roughly 2 feet (60 cm) tall at the shoulder. Its middle toe had a light-weight hoof wth a large, weight-supporting middle toe; the head was long and pointed (the jaws were shallow). Mesohippus lived during the middle Oligocene (about 37-32 million years ago) in the Great Plains and foothills of the Rockies of North America. It had low-crowned teeth that could grind relatively well; its premolars were beinning to resemble its molars. Mesohippus' diet consisted of leaves from shrubs and low trees. Classification: Order Perissodactyla, Family Equidae.

From:http://www.enchantedlearning.com/subjects/dinosaurs/

Mesohippus
Age: Oligocene (33 million years)
Location: White River Formation, Nebraska