Things look grim for Barbaro

The champion horse has laminitis in his left hind foot.

"His ears are up, he's bright, he's looking around," Dr. Dean Richardson said Thursday. "If you look at this horse, it'd be hard to put him down."

That precisely is the heartbreaking task that could be imminent because of a hoof disease so serious Richardson said the Kentucky Derby winner is "a long shot" to survive.

"It could happen within 24 hours," Richardson said during a news conference at the University of Pennsylvania's New Bolton Center.

Richardson said Barbaro has a severe case of laminitis in his left hind leg -- a painful, often fatal disease caused by uneven weight distribution in the limbs.

"If he starts acting like he doesn't want to stand on the leg, that's it. That will be when we call it quits," he said.

ESPN: Barbaro has life-threatening inflammation in hind foot