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For
, dog lovers have been incorrectly calculating the
of their pet pooches. People have
worked out their dog's age in "human years" by
by seven. However, researchers at the University of California San Diego School of Medicine in the USA have come up with a new
. They say it more
determines canine age. Their new method requires a
more than simple mental arithmetic to work out a dog's age. It involves a
of the genomes of dogs and humans. Scientists had to analyse how DNA changes as humans and dogs age. The scientists regard such DNA
as the best way to measure the ageing speed of
.
