![]() The researchers developed the following equation to calculate a dog’s age in human years based on this information: human age = 16 ln(dog age) + 31. The first 8 weeks of a dog’s life aligned well with the first 9 months in humans, and culminated in life expectancies of 12 and 70 years, respectively. The data showed that major developmental milestones lined up between the two species. As both humans and dogs get older, methyl groups are added to their DNA, enabling the use of mathematical models known as “molecular clocks” to measure age. This can change DNA activity without changing the DNA sequence. ![]() Methylation is a biological process in which methyl (CH3) groups are added to DNA molecules. They then compared the data with methylation patterns in humans. Scientists from the University of California, San Diego, the National Institutes of Health, the University of Pittsburgh, School of Medicine, and the University of California, Davis, School of Veterinary Medicine investigated methylation patterns in the DNA of a group of 104 Labrador Retrievers aged 4 weeks to 16 years. Research has revealed a new way to think about calculating a dog’s age in human years. The problem is that dogs age much more rapidly than humans do during the first years of life. The “multiply by 7” idea was likely derived from the average worldwide lifespans for dogs and humans, 10 and 70 years, respectively. While this is an easy way to come up with a number, research has shown that it is not very accurate. ![]() You are probably familiar with the “multiply by 7” rule to determine your dog’s equivalent age in human years.
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