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Dallas Seavey has won the race several times and lost to his father in this year's race. Four of his dogs tested positive for an opiod pain-killer, Tramadol. Because the race organizers cannot prove he administered the drug, Seavey [photo] will keep his $59,000 in winnings. A documentary director of a film about sled dogs said the race is all about winning regardless of inhuman treatment of the dogs. The race has lost sponsors as result of the criticisms, notably Wells Fargo. Seavey has said he will withdraw from next year's race after criticizing the organizing trail committee for its handling of the doping issue. He denies he doped his dogs and believes their food was adulterated. The committee has changed this year's rules to put the disqualification of a positive drug result on the musher unless they can show the doping was beyond their control.