7 years old: small and medium dogs are about in their mid-40s, while large and giant breeds are in their 50s.3 years old: dogs are in their human-equivalent early 20s.0-2 years old: of a dog’s life roughly equals the time humans take to reach adult size or post-puberty.In simplest terms dog years to human years is: We then applied a variety of biological metrics and data to calculate canine years into an equivalent human age. We began by dividing dogs into four size categories (cats only needed one) since smaller dogs tended to live longer. Ultimately, we created the age tables that continue to serve as the template for more modern charts. We reviewed the latest research on aging and worked hard to gain scientific consensus. I was part of a team that developed one of the first pet aging charts in 1999.
They reckoned that since people lived to be about 70, that made for a simple equation of dog years to human years. These were likely larger dogs living outdoors with little, if any, medical or preventive care. My guess is that sometime during the past 100 years, folks observed that many dogs lived to be about 10 to 12 years of age. It’s unclear how the “1- equals-7” calculation was derived. Chances are you’ve heard the dog-years-to-human-years tall tale about dog aging: “One year in a dog’s life equals seven in human years.” Despite the continued efforts of veterinarians over decades, that fallacy persists.
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