I would go with the dragon creatures. They most likely bread them to bear the Nazgul just like those horses were bread specialy for them. When the horses failed them at the ford they must have replaced them with the dragons.
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Tiro! Êl eria e môr. Look! A star rises out of the darkness
I 'lîr en êl luitha 'uren. The song of the star enchants my heart
Ai! Aníron... An!I desire...
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