Douglas Barnes/AP Photo
A common rule of thumb for dog owners is that one year for dogs is equivalent to seven human years.
But new research shows that young puppies age much faster than young humans do, so that simple one-to-seven year ratio is wrong.
A 1-year-old dog is more "like a 30-year-old human," one scientist said.
But as dogs get older, they age more slowly. So the researchers found that a 12-year-old labrador would be the equivalent of 70 in human years.
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