Check out the scientific classification of horses within the Mammalia class.

Phylum:

Chordata

Class:

Mammalia

Order:

Perissodactyla

Family:

Equidae

Species:

Equus caballus

Perissodactyla means "odd toed" and rhinos and tapirs belong to this order as well as horses.

The Equidae family consists of horses, asses and zebras and there are 9 species within this genus and the domestic horse or pony is "Equus caballus". The Equidae family have a mane, 40-42 teeth, and skulls with long nasal bones. They are herd animals and fast runners preferring to flee from danger rather than face it. The Equidae family are herbivores.