FILE- In this March 4, 2017, file photo, four-time and defending champion Dallas Seavey mushes during the ceremonial start of the Iditarod Trail Sled Dog Race in Anchorage, Alaska. Seavey denies he administered banned drugs to his dogs in this year's race, and has withdrawn from the 2018 race in protest. The Iditarod Trail Committee on Monday, Oct. 23, 2017, identified Seavey as the musher who had four dogs test positive for a banned opioid pain reliever after finishing the race last March in Nome. (AP Photo/Michael Dinneen, File)

FILE- In this March 4, 2017, file photo, four-time and defending champion Dallas Seavey mushes during the ceremonial start of the Iditarod Trail Sled Dog Race in Anchorage, Alaska. Seavey denies he administered banned drugs to his dogs in this year's race, and has withdrawn from the 2018 race in protest. The Iditarod Trail Committee on Monday, Oct. 23, 2017, identified Seavey as the musher who had four dogs test positive for a banned opioid pain reliever after finishing the race last March in Nome. (AP Photo/Michael Dinneen, File)

ANCHORAGE, Alaska (AP) — Cycling. Baseball. Track. Horse racing. Now dogsledding has become the latest professional sport to be engulfed in a doping scandal, this one involving the huskies that dash across the frozen landscape in Alaska’s grueling, 1,000-mile Iditarod.

The governing board of the world’s most famous sled dog race disclosed Monday that four dogs belonging to four-time Iditarod champion Dallas Seavey tested positive for a banned substance, the opioid painkiller tramadol, after his second-place finish last March.

It was the first time since the race instituted drug testing in 1994 that a test came back positive.

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Seavey strongly denied giving any banned substances to his dogs, suggesting instead that he may have been the victim of sabotage by another musher or an animal rights activist. He accused the Iditarod of lax security at dog food drop-off points and other spots.

Race officials said he will not be punished because they were unable to prove he acted intentionally. That means he will keep his titles and his $59,000 in winnings this year.

But the finding was another blow to the Iditarod, which has seen the loss of major sponsors, numerous dog deaths, attacks on competitors and pressure from animal rights activists, who say huskies are run to death or left with severe infections and bloody paws.

Jeanne Olson, an Alaska veterinarian who treats sled dogs, sees no benefit in administering tramadol during a race because it causes drowsiness. Olson, who was the head veterinarian in the Yukon Quest International Sled Dog Race in the 1990s, prescribes it mostly for profound pain relief.

“But I also caution that the dogs are going to become sedated from it,” she said. “So when I first heard ... that it was tramadol as the drug, I thought, ‘Well, that’s surprising. Why would anybody use that?’”

People for the Ethical Treatment of Animals seized on the scandal Tuesday, saying, it’s “further proof that this race needs to end.”

Fern Levitt, director of the documentary “Sled Dogs,” an expose on the treatment of the huskies, said, “The race is all about winning and getting to the finish line despite the inhumane treatment towards the dogs.”

Frank Teasley, founder and executive director of Wyoming’s Stage Stop Sled Dog Race, said the controversy is a shame but doesn’t believe it will be a permanent stain on the sport. Teasley has participated in eight Iditarods and knows many of the top contenders, including Seavey, saying he believes the musher was sabotaged.

“When you’re dealing with animals, doping anything is not acceptable. But I do not believe that Dallas did this,” he said. “I’ve known him since he was, like, 8 years old. It’s not in his nature.”

Iditarod CEO Stan Hooley acknowledged the race is in its darkest time as it grapples with the fallout from the scandal.

“I’m quite confident that at some point we’ll emerge from this storm and move on,” he said. “But for now, we’re dealing with some unpleasantness that needs to be dealt with.”

Asked about Seavey’s sabotage claims, Hooley said, “Is it possible? I suppose so. Is it likely? I wouldn’t think so.”

Still , he said discussions are underway to increase security at the dog lot in Nome and at various checkpoints.

Seavey won the annual Anchorage-to-Nome trek in 2012, 2014, 2015 and 2016 and has had nine straight top 10 finishes. He finished second this year to his father, Mitch, who collected a first-place prize of $71,250.

Dogs are subject to random testing before and during the race, and the first 20 teams to cross the finish line are all automatically tested.

“I did not give a drug to my dog. I’ve never used a banned substance in the race,” the 30-year-old Seavey said in an interview.

He said tramadol is not used at his kennel, and it is “incredibly unlikely” it was accidentally administered by anyone on his team.

Instead, he complained of inadequate security at checkpoints along the route where dog food is dropped off weeks ahead of time and at the dog lot in Nome, where thousands of huskies are kept after the race before they are flown home.

“Unfortunately I do think another musher is an option,” he said. He added: “There are also people who are not fans of mushing as a whole. They are numerous videos out that are trying to say mushing is a bad thing. And I can see somebody doing this to promote their agenda.”

Seavey said whoever gave the drug to the dogs knew it would cause a positive test, and “that should make me and my people the least likely suspect.”

Earlier this year, the Iditarod lost a major corporate backer, Wells Fargo, and race officials accused animal rights organizations of pressuring the bank and other sponsors with “manipulative information” about the treatment of the dogs.

Five dogs connected to this year’s race died, bringing total deaths to more than 150 in the Iditarod’s 44-year history, according to PETA’s count. And last year, two mushers were attacked by a drunken man on a snowmobile in separate assaults near a remote village. One dog was killed and others were injured.

Seavey said he has withdrawn from next year’s race in protest and expects the Iditarod Trail Committee to ban him anyway for speaking out. Mushers are prohibited from criticizing the race or sponsors.

Iditarod spokesman Chas St. George said a ban would be up to the committee’s board of directors.

The committee decided to release Seavey’s name after scores of competitors demanded it. Race officials initially refused, saying it was unlikely they could prove the competitor acted intentionally.

During this year’s race, the rules on doping essentially said that to punish a musher, race officials had to provide proof of intent. The rules have since been changed to hold mushers liable for any positive drug test unless they can show something beyond their control happened.

Wade Marrs, president of the Iditarod Official Finishers Club, said he doesn’t believe Seavey intentionally administered the drugs. He said he believes the musher has too much integrity and intelligence to do such a thing.

“I don’t really know what to think at the moment,” Marrs said. “It’s a very touchy situation.”

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Follow Rachel D’Oro at https://twitter.com/rdoro .