The dog, Otis, is due to be destroyed after being seized under the Dangerous Dogs Act by police who believed he was a pit-bull terrier.
But campaigners, who will hand in a petition at Limehouse police station in east London this morning, claim he is a great dane cross.
A spokesman for the Endangered Dogs Association said: 'Four leading dog experts have stated Otis to be a cross'
Police saw Otis unmuzzled in the car of his owner, Harry Bates, in 1991. Mr Bates was convicted of having an unmuzzled pit-bull terrier in public before dog experts provided evidence that Otis was a great dane cross.
Scotland Yard said: 'We are obliged to carry out the destruction order because it was made by a court.'Reuse content