Shetland pony

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The Shetland pony is a breed of pony that is very strong for its size. Shetland ponies have heavy coats, short legs and are considered quite intelligent.

They are a very strong breed of pony, used for riding, driving, and pack purposes.
Shetland ponies are generally gentle, good-tempered (though they can become impatient and snappy if poorly handled), and very intelligent by nature. For its size, the Shetland is the strongest of all horse and pony breeds.

It can pull twice its own weight under circumstances where a draft horse can only pull approximately half its own weight.