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Hyracotherium, the earliest-known ancestor of the modern horse, is estimated to be only 60 cm in length and only weighs around 15 to 16 kg (36 lb), which is the size of a small to medium-sized dog.

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How small were the first horses?

The first hose ancestor, Eohippus was 250-450 mm in height, about the size of a Fox.


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