prancer

from WordNet (r) 3.0 (2006)

prancer
    n 1: a mettlesome or fiery horse

from The Collaborative International Dictionary of English v.0.48

Prancer \Pran"cer\, n.
   A horse which prances.
   [1913 Webster]

         Then came the captain . . . upon a brave prancer.
                                                  --Evelyn.
   [1913 Webster]