Have you noticed how much pony-play gear and equipment the Stockroom offers? I think you would almost have to start with this Pony Head Bridle Set including head harness, ears, optional muzzle, and your choice of blinders or blindfold (both included):

pony-bridle-set

The body harness, bit, and tail are each sold separately.

They say (surely they must?) that spring is an excellent time to train a pony…

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