beautiful, fine, good, lovely, magnificent
She rode her beautiful horse across the meadow every morning before work.
bay, black, chestnut, grey, piebald, roan, skewbald
highly-strung, nervous, restless, skittish
frightened, startled, terrified
fancied
The fancied horse stumbled at the final jump and lost the competition.
loose, riderless, runaway
A riderless horse galloped through the village after escaping from the farm.
fresh
The rider stopped at the inn to get a fresh horse before continuing his long journey.
heavy, shire
A shire horse pulled the old wagon slowly down the country lane.
carriage, cart, carthorse
pantomime
The children laughed loudly when the pantomime horse fell over during the Christmas show.