Charlotte Dujardin

The duo won gold medals in the individual and team dressage contests at the London 2012 Olympics and added another individual title at the 2016 Olympic Games.

Charles Owen said it considers any 'actual or perceived mistreatment' of any horse to be totally unacceptable.

Team GB dressage rider Carl Hester has signed a letter condemning Charlotte Dujardin after a video emerged of her repeatedly whipping a horse during training.