From BBC:
http://news.bbc.co.uk/2/hi/science/nature/8470962.stm

His photograph was chosen out of more than 43,000 competition entries in October 2009.
Louise Emerson from the Wildlife Photographer of the Year competition office explained that the judging panel had been "reconvened" and had concluded that it was likely that the wolf featured in the image was an animal model that could be "hired for photographic purposes".
This, she said, was in breach of the competition rules which are made available to all entrants.
"The judging panel looked at a range of evidence and took specialist advice from panel judges who have extensive experience of photographing wildlife including wolves," continued Ms Emerson.
"They also considered the responses to specific questions put to the photographer."
Wildlife photographer Mark Carwardine was one of the competition judges. He told BBC News that this was the first time in its 46 year history that there would not be a winner.
Mr Carwardine explained that he and his fellow judges had gathered evidence and sought the opinions of wolf experts in order to reach their decision.
The experts compared the winning picture to pictures of Ossian, a tame wolf that lives at a zoological park near Madrid called Canada Real.
"You can see several very distinctive markings and the experts all agreed that, yes, it's the same wolf," said Mr Carwardine.
"We disqualified [Mr Rodriguez] and banned him for life from entering the competition again, so I think that sends a strong message."
Mr Carwardine added that Mr Rodruiguez had, throughout the investigation, denied "hiring" Ossian for the photograph. The disqualified photographer maintains that his subject was a wild wolf.
Mr Rodriguez was not immediately available for comment.