Viewers have reacted angrily after it emerged that the Britain's Got Talent winning dog did not perform a tightrope stunt in his winning routine.
Last night's final, won by Jules O'Dwyer and her border collie Matisse, drew 13.4 million viewers and became this year's highest rating TV show so far.
But O'Dwyer, who trains guide dogs, today revealed that it was another of her dogs - Chase - who walked the tightrope because Matisse is not keen on heights.
The act featured O'Dwyer, dressed as a policewoman, going after Matisse, who had stolen sausages from a butcher, and also featured another of her pets, three-legged Skippy.
Watch the routine below.
The pair beat Welsh choir Cor Glanaethwy and magician Jamie Raven to the £250,000 prize.
There was no sign of Matisse's double, Chase, who had previously appeared in the semi-final when they appeared on stage after their win.
O'Dwyer told ITV show Lorraine: "Matisse is a little bit afraid of heights so, although he could physically do it, Chase is the dog who says 'I'm the action dog'.
"He plays the double for him," she said. "Every dog has a different character."
Annoyed fans expressed their irritation on Twitter, saying that another dog had performed the trick which won them the show.
It came as ITV released voting figures which showed O'Dwyer and Matisse won by just 2% - getting 22.6% of votes compared to 20.4% for magician Raven.
But others described the furore as a storm in a teacup.
O'Dwyer said that her win - which also includes a spot at this year's Royal Variety Performance - would bring her financial security.
She said that she worked for three months on the tightrope element of the final sketch, just "in case" they got through to the last night.
The producers of Britain's Got Talent have apologised for the fact it was not made clearer to viewers that Chase completed the tight-rope section of the act.