A fierce winter storm in the last stretch of this year's Iditarod Trail Sled Dog, which ultimately forced six mushers to scratch the same day, now has cost three other mushers for sheltering their dogs instead of leaving them outside in the harsh conditions. 

Mille Porsild of Denmark, Michelle Phillips of Canada and Riley Dyche of Fairbanks were penalised for taking dogs inside shelter cabins to ride out the storm with winds so strong, they whipped up white-out conditions, the Anchorage Daily News reported on Friday. 

The decision to punish the mushers was made by race marshal Mark Nordman, who said the indoor rest for the dogs amounted to a competitive advantage over teams that trailed them into Nome. 

Canadian musher Michelle Phillips has announced this year's event was her final Iditarod. She was penalised for keeping her dogs safe during a harsh storm. Photo / AP 

"No doubt that Michelle and Mille did the right thing for their dogs," Nordman said. "But it also affected the competition for racers going forward." 

Porsild was dropped from 14th to 17th position, while Phillips dropped one notch to 18th. Dyche wasn't demoted in the standings, but he was fined $1000 after officials determined there were no other mushers close to him that would have been affected by the dogs resting inside. 

The drop in finishing position equated to $3450 less for Porsild and $1000 less for Phillips. 

Iditarod winner Brent Sass poses for photos with lead dogs Morello, left, and Slater in the finish chute of the Iditarod Trail Sled Dog Race in Nome, Alaska on March 15. Photo / AP 

The nearly 1609-kilometre race across Alaska was won March 15 by Brent Sass, who was also affected by the storm just as he was nearing the finish line in Nome. He said he fell off the sled and couldn't see anything, and thought he was going to have to hunker down with his dogs and ride out the storm. 

The demotion of the three mushers, which was not widely publicised by the Iditarod, immediately drew a harsh retort from the race's biggest critic, People for the Ethical Treatment of Animals. 

"Nothing makes it clearer that this death race must end than the fact that the Iditarod slapped mushers with a fine as punishment for acting to prevent dogs' deaths," PETA Executive Vice President Tracy Reiman said in a statement Friday. 

She called for cruelty charges to be filed against mushers who did leave their dogs outside while they went inside shelter cabins, "Cruelty is baked into this deadly race, and it's time for it to stop." 

Porsild defended her decision bring the dogs inside. 

"Stopping and having the dogs in the shelter cabin gave Michelle and I no competition edge; on the contrary we both lost the edge we had – especially me and my team," she wrote to the Daily News from Denmark. 

Iditarod rules say dogs cannot be taken inside shelters except for race veterinarians' medical examination or treatment. However, the entry immediately after that one in the Iditarod rule book says: "There will be no cruel or inhumane treatment of dogs. Cruel or inhumane treatment involves any action or inaction, which causes preventable pain or suffering to a dog." 

Four mushers – Matt Hall, three-time champion Mitch Seavey, Lev Shvarts and former champion Joar Leifseth Ulsom – filed complaints against Porsild and Phillips. Hall and Seavey were each moved up a spot when Porsild and Phillips were demoted, and Shvarts moved up two spots. 

Mille Porsild of Denmark wrote to the race marshall that if she'd left her dogs outside unprotected it could have led to the death of dogs. She was dropped from 14th to 17th place. Photo / AP 

"There was no doubt to me that my dogs sitting unprotected in these conditions could lead to death or deaths of dog(s)," Porsild wrote in an email to Nordman after the race, explaining why she did it. 

"With no natural wind breaks or materials available to shelter them I made what I felt was the best choice for my dog's welfare in that extreme situation," Phillips wrote on Facebook. 

Separately, Dyche also took his team inside a different shelter cabin to avoid the storm and was fined for not informing race officials he did so. 

Dyche told the newspaper that he knew it was a violation to bring the dogs inside, but he had no choice after failing to improvise a windbreak for them. He said as he sat in the cabin with the dogs for the next 24 hours and heard the winds hammer the cabin, he knew he made the right decision. 

Porsild, who returned to Norway after the race, was not informed by race officials of the demotion. She found out only when Phillips told her days later. 

Phillips announced on Facebook that this was her last Iditarod.