He is Britain's biggest dog, a title that brings in a steady income of pats and scratches.
But fame does not pay the vet's bills, as Samson the Great Dane-Newfoundland cross has discovered.
His owners, Julie and Ray Woods, are struggling to find the money for a life-saving £1,400 operation on his leg.
Operation: 6ft 6in Great Dane-Newfoundland cross Samson faces being put down if he doesn't get surgery on a ruptured cruciate ligament
Samson, who stands 6ft 6in on his hind legs, has ruptured a cruciate ligament and without the surgery may have to be put down.
Mr and Mrs Woods, who rescued him from an RSPCA centre when he was six months old, say they cannot afford the fee.
Mrs Woods, 54, is disabled and lives on benefits with her husband 65, as her carer in Wyberton, Lincolnshire.
They already have to find the money for Samson's twice-daily meals of dry food and turkey legs.
Until now the animal charity PDSA has helped them pay for Samson's vet bills, but it cannot stretch to this one. So the couple has started an appeal to the public for help - an SOS to 'Save Our Samson'.
Julie Woods with Samson, who is so big he sits on the sofa like an adult
Mrs Woods said: 'Samson is in crisis. Without the surgery it could end up being euthanasia. It really is quite desperate. We are very upset, we love him to bits.
'At the moment Samson is on painkillers and has been told to rest but you try stopping a 20-stone dog from tearing around.
'He is so big that when he comes in and goes on the sofa he sits down like an adult would.'
She added: 'PDSA have been brilliant because it has so far cost quite a lot of money but unfortunately they can't pay for such expensive surgery.
'We are just appealing to anybody who can help.'
Save Our Samson: Britain's biggest dog at 6ft 6in needs a life-saving operation or faces being put down | Mail Online