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poney Shetland - french translation of Shetland pony
it comes from shetland and is a pony
the shetland pony is a breed of pony.. not a "catergory" as such
I do believe that the Dartmoor pony is more rare than the Shetland pony.
There is the Shetland Pony Studbook Society, and the Pony breeders of Shetland Association. Both are listed in the related links below.