How Old is Your Dog in human years?

How Old is Your Dog in human years?

Dog’s age much faster than we do. To get you started, here is a table and formula to convert your dog's age to human age.

Human Year Conversion Table

One year of age for a small dog (e.g. Toy Poodle, Chihuahua, Dachshund, Papillon) or a medium sized dog (e.g. Shiba, Welsh Corgi Pembroke, Japanese Spitz) is equivalent to 15-16 years of age for a human.

After the age of 1 year, the speed of growth gradually slows down and the human age can be calculated by the following formula.
*After the age of one year, dogs grow at different speeds between small and medium sized dogs and large dogs.

Large breed dogs(After the age of 1 year) (e.g. Golden Retriever, Labrador Retriever etc.) are considered to be about 12 years old, and as their growth rate changes after the age of 1 year, as with small to medium breeds, the following formula is used to calculate their human age.

At the age of 1 year, small to medium sized dogs are older than large dogs, but after the age of 4 years, large dogs tend to be older than small to medium sized dogs. This difference in growth speed may be the reason why it is generally believed that large-breed dogs have a shorter lifespan than small-breed dogs.

『2019 Epigenetic Clock Study

A 2019 study by researchers at the University of California San Diego put forth a new method for calculating dog age, based on changes made to human and dog DNA over time. In both species, methyl groups are added to DNA molecules throughout aging, altering DNA activity without altering the DNA itself. As a result, DNA methylation has been used by scientists to study aging in humans through an “epigenetic clock.”

 2019 Epigenetic Clock Study the research team performed targeted DNA sequencing in 104 Labrador Retrievers spanning a 16-year age range, in an attempt to compare dogs’ epigenetic clocks to those of humans. The results allowed them to derive a formula for adjusting dogs’ ages to “human years”, by multiplying the natural logarithm of the dog’s age by 16 and adding 31 (human age = 16ln (dog age) + 31). This natural logarithm calculator can help.

Sources: The American Kennel Club

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