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Although Rachel and Charlie are hoping Einstein is crowned the world's smallest horse, the title currently belongs to a dwarf horse named Thumbelina. "Thumbelina is what's called a dwarf horse," Rachel says. "She has a head that's disproportionately large. She has these tiny little legs, and this really big body. Essentially she's a little bit shorter than Einstein, but she weighs twice as much as he does." Rachel thinks there should be a category for dwarf horses and a category for non-dwarf horses. "She's so cute, but she's really different than him," she says.