That was the announcement from Belgian rider Gudrun Patteet earlier this morning. The 55th-ranked show jumper in the world broke the news after her World Cup Final horse Sea Coast Pebbles Z was not accepted for the competition in Gothenburg, Sweden due to a habitual movement of his leg. The entries list has already been amended with Patteet's two other non-World Cup horses still listed. 

The rest of the rider's statement follows: 

"The vet at this show has decided not to accept him as fit to compete because of his stringhalt . (Pebbles always lifts up his right hind leg much higher then the left one). All winter he has passed vet checks, moving this way, at all 5* shows and world cup qualifiers. He did great results and qualified us for this final. 
But unfortunately here they decided not to accept him. 
I am trying to understand why they accepted him at all the other vet checks , where he was moving the same way, but not here at the final.... I will stay here the rest of the week to compete in the other classes with my 2 other horses and to support my Belgian teammates for the final."