It shows Charlotte Dujardin whipping a horse’s legs multiple times.
Dujardin was provisionally suspended for six months on Tuesday after equestrian’s governing body launched an investigation into her conduct.
The video, aired on the Good Morning Britain news program on Wednesday, shows Dujardin walking beside the horse, which is carrying another rider, and whipping it along.
The International Equestrian Federation (FEI) is investigating the video, which it said showed she had engaged in “conduct contrary to the principles of horse welfare”.
Djuardin said in a statement announcing her Olympic withdrawal on Instagram on Tuesday that the footage showed her making an error of judgment that was out of character and did not reflect how she trained her horses or coached her pupils.
“I am deeply ashamed and should have set a better example in that moment,” she wrote.
Dujardin’s UK Sport funding has been suspended while the FEI investigates. The BBC reports she has also been dropped as an ambassador for horse welfare charity Brooke, which said it was “deeply disturbed” by the video, and has lost sponsors.
The FEI received the video from lawyer Stephan Wensing on Monday. The 19-year-old complainant’s name has not been revealed, but she is being called a “whistleblower”.
Wensing said his client had mixed feelings about the reaction to the revelations, but she believed it is a widespread issue in dressage.
“It’s not fun to ruin a career. She’s not celebrating; she doesn’t feel like a hero,” he said.
“But she told me this morning this had to be done because she wants to save dressage.”
Equine abuse was also in the spotlight at the modern pentathlon event at the Tokyo Olympics when a German coach struck a horse that refused to jump a fence.
The modern pentathlon will replace its equestrian element with obstacle racing after the Paris Games.
Animal rights organisation PETA renewed its call for equestrian events to be banned from the Olympics.
“The message to the International Olympic Committee should be clear by now: Remove equestrian events from the Olympic Games,” PETA said on Wednesday.
“Yet again, an Olympic rider has been caught on video abusing a horse to force the animal to behave in an entirely unnatural way, simply for her own glory.
“Horses don’t volunteer – they can only submit to violence and coercion. It’s time for the Olympics to move into the modern era.”
Dujardin won three golds, a silver and two bronze medals at the London, Rio and Tokyo Games in individual and team dressage.
With six medals, she is Britain’s joint-most decorated female Olympian alongside cyclist Laura Kenny.
Dujardin’s teammate, Carl Hester, said earlier this month that all riders needed to pay close attention to horse welfare.
“Trying to show how well we look after our horses, how fairly they’re treated, that sport is not unfair on the equine partners. I think we all have to pay attention to that,” he said.
“They got rid of animals in circuses, didn’t they? Because that was unfair, and we’ve got to make sure that doesn’t happen in equestrian sport.”
-TND with AAP
