"Disappointed for everyone involved," he wrote on Twitter, "especially the horse. Hope to get him back on the track."
Motion and Team Valor CEO Barry Irwin had planned for Animal Kingdom, who had run in just one race since being hurt in the Belmont, to run in the $10 million Dubai
"This is a crushing blow for our company and our partners as well as our trainer, who has done such a great job getting the horse back to this point," Irwin said. "If he comes out of this OK, hopefully we can run in the World Cup in 2013."
Animal Kingdom worked 5 furlongs on Saturday at Palm Meadows, his first serious drill since he won a turf allowance race at
Animal Kingdom won his return race in typical, stirring Animal Kingdom fashion.