Barbaro's racing career ended abruptly in the Preakness, when the horse suffered a leg injury. On Thursday, veterinarian Dean Richardson announced that the horse had developed laminitis, a sometimes painful leg inflammation.
"Barbaro was out of his sling for more than 12 hours yesterday, and he had a calm, restful night, sleeping on his side for more than four hours," Richardson said. "While his condition is stable, it remains extremely serious."
At Thursday's news conference, Richardson said that Barbaro's owners, Roy and Gretchen Jackson of West Grove, Pa., planned to keep treating the horse as long as he is not in severe pain.