The owners of Bella say that she is at least 29 years old. That's 203 if every year of a dog's life equals seven human years. David Richardson, 76, said he bought the Labrador cross from an RSPCA rescue centre about 26 years ago when she was at least three years old. The faithful pet is believed to be the world's oldest living dog and could even be the oldest dog ever. Unfortunately her owner has no documentation to prove her precise date of birth and so Bella's extraordinary longevity will never enter the record books. Does it matter?