COLUMBIA -- A declawed, defanged bear is chained to a stake as hunting dogs bark and snap, trying to force the bear to stand on its hind legs. The training exercise called bear baying is intended to make the bears easier to shoot in the wild and it's allowed only in South Carolina.

Armed with new undercover video of four such events, the Humane Society of the United States is pressuring state officials to explicitly outlaw the practice, which the organization says is effectively banned in every other state. Animal rights advocates say it's cruel to the nearly defenseless bears and harms them psychologically.

Hunters say the exercise popular in the state's hilly northwestern corner helps them train their dogs on what to do when they come across a bear.

But John Goodwin, the Humane Society's chief animal fighting expert, calls it "bear baiting," a centuries-old bloodsport that is more for spectators' entertainment than instruction for dogs on what to do when they encounter wild bears.

"This isn't about training dogs. This is a competition," Goodwin said a news conference in Columbia on Monday. "If this is their idea of training a dog for hunting, then they're sending that dog on a suicide mission."

State law on the issue is murky. Statutes banning animal fighting have a specific exemption for dog training. And while South Carolina Attorney General Henry McMaster says animal cruelty laws prohibit bear baying, he hasn't prosecuted any cases.

On Monday, a spokesman for McMaster's office said prosecutors were reviewing the videos. The videos, which were filmed with hidden cameras by activists posing as spectators, show an adult black bear standing on all fours, its back to a 4-foot high wooden fence, tethered to the ground by several feet of chain. The bear rises onto its hind legs as three hounds sprint toward it, which is precisely the point: Hunters have a better chance of killing a bear swiftly with a shot to its exposed underbelly.

"We really view this as a throwback to the days of the Roman Colosseum, when people filled an arena as spectators to watch animals pitted against each other," said Michael Markarian, the Humane Society's chief operating officer.

But the Humane Society's videos show no bloodshed. Handlers need their dogs healthy for hunting, and the bear is needed for more exercise sessions.

"It's just training," said Brian Kelly, a hunting enthusiast who organized a bear baying in Greenville County in February. "There's no dogs that get in any conflict with the bear, and the dog does not get hurt."

Kelly said the bear is kept in a cage while dogs on 3-foot leashes bark at it, with judges rating the dogs on how well they pay attention to and become accustomed to being close to the much bigger animal. That description isn't backed up by the Humane Society's videos, which clearly show the dogs and bear swatting each other. The dogs aren't on leashes, and one of them was injured after the bear slapped it, Markarian said.