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It depends; if you are christian, most Christians believe God spoke, and horses and all other animals appeared on earth in that first week.

However, if you are not, scientists believe in the big bang theory where an explosion turned into the universe and then there were tiny organisms that evolved over thousands of years to become different animals. 55 million years ago, scientists believe the first ancestor of the horse, eohippus, lived, so if you believe in that, then the answer would be about 55 million years ago.

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14y ago

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