Dobbin

Noun

 * 1) An old jaded horse.

Thesaurus
Houyhnhnm, brood mare, charger, colt, courser, critter, entire, entire horse, equine, filly, foal, gelding, horse, mare, mount, nag, prancer, stallion, steed, stud, studhorse, tarpan, top horse, war-horse, wild horse