A horse that is not entitled to take part in a race, but is fraudulently got into it.
a contestant entered in a competition under false pretenses
a counterfeit, especially a superior horse passed off as an unknown, or professional athlete posing as an amateur
a falsely identified horse entered in a race below its class, giving it an almost certain chance to win
a horse disquised as another horse
a horse substituted for another of similar appearance in order to defraud the bookies
an impostor, specifically someone who enters a sports competition under false pretenses
A horse (or greyhound) entered in a race under another's name - usually a good runner replacing a poorer one.
A greyhound (or horse) entered in a race under another's name -usually a good runner replacing a poorer one.
A substituted dog closely resembling another