Horses evolved from a foot tall, swamp dwelling, four toed, drawn horse, called the O Equus
O Merychippus
O Oligohippus
O Pliohippus
O Eohippus
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eqqus

Explanation:

Equus—the genus to which all modern equines, including horses, asses, and zebras, belong—evolved from Pliohippus some 4 million to 4.5 million years ago during the Pliocene. Equus shows even greater development of the spring mechanism in the foot and exhibits straighter and longer cheek teeth