A four-year-old dog is similar to a 52-year-old human. A four-year-old dog is similar to a 52-year-old human. Generally, a two month old Labrador Retriever puppy has the body age of a three year old child. According to this theory, a 4-year-old dog would be 28 years old in "human years." Then by seven years old, dog aging slows. Life expectancy varies by time in history, country and gender (male/female). So, what about Labs? Continue scrolling to keep reading Click the button below to start this article in quick view. Subtract 5 from the dog’s age in years for dogs over 5 years old. Importantly, the conversion for dog years to human years is directly based on human life expectancy. Scientists at UC San Diego say they have debunked that myth — … This theory began back in the 1950s and is based on the assumption that humans live to be about 70-years-old (which was probably accurate during that time). Small dogs weighing 20 pounds or less are approximately 40 in human years while they are only 6 in dog years. Step 5. Senior Dogs. It’s hard to be too specific on how each year of a dog’s life translates to human years but by its second year, your dog will be a fully-grown adult and typically 24 years old depending on breed. Most dog lovers have heard the old adage that one human year is equal to seven years for our canine friends. The larger the dog, the faster it ages. Multiply this number by 4, which would give you 8. Then by seven years old, dog aging slows. By this time, dog aging has slowed down, so an 8-year-old dog is like a 64-year-old human. In your dog’s fifth year of living in the big world, this is when they start a little more rapidly. So a Great Dane that is two years old might be the human equivalent of 30 years old while a Yorkie of the same age would be the equivalent of 15 years old in human years. Your 13 years 0 month old Cavador is 75.25 years old in human years and is considered as a Senior dog. According to this equation, the average 12-year Labrador lifespan is equivalent to a human … The 10 year old large dog and the 14 year old small dog are essentially both 80 year olds in human years. For example, to determine the human age of a 4-year-old dog, you would subtract 2 from 4, which would leave you with 2 as the remainder. Add 24 to 8 to get 32, which is a 4-year-old dog’s age in human years. Large dogs reach middle age faster than small dogs. For larger dogs, add 2 more years. For example, in 2011 Japan had an overall life expectancy of 83 years and Sierra Leone had a life expectancy of 47. 40 Fine. “This makes sense when you think about it — after all, a nine-month-old dog can have puppies, so we already knew that the 1:7 ratio wasn’t an accurate measure of age,” Ideker said. A one-year-old dog is similar to a 30-year-old human. 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