Add 24 to 8 to get 32, which is a 4-year-old dog’s age in human years. The 10 year old large dog and the 14 year old small dog are essentially both 80 year olds in human years. Life expectancy varies by time in history, country and gender (male/female). Senior Dogs. Scientists at UC San Diego say they have debunked that myth — … 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. In your dog’s fifth year of living in the big world, this is when they start a little more rapidly. According to this equation, the average 12-year Labrador lifespan is equivalent to a human … Continue scrolling to keep reading Click the button below to start this article in quick view. Then by seven years old, dog aging slows. Step 5. Small dogs weighing 20 pounds or less are approximately 40 in human years while they are only 6 in dog years. Then by seven years old, dog aging slows. Multiply this number by 4, which would give you 8. By this time, dog aging has slowed down, so an 8-year-old dog is like a 64-year-old human. A four-year-old dog is similar to a 52-year-old human. 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. 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. A one-year-old dog is similar to a 30-year-old human. The larger the dog, the faster it ages. 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). Importantly, the conversion for dog years to human years is directly based on human life expectancy. Most dog lovers have heard the old adage that one human year is equal to seven years for our canine friends. After a little mathematics, we can estimate rough ages for the different size categories: for every year of age into adulthood, a larger dog ages about eight years in human years, and a smaller dog ages roughly six years. For larger dogs, add 2 more years. Subtract 5 from the dog’s age in years for dogs over 5 years old. For example, in 2011 Japan had an overall life expectancy of 83 years and Sierra Leone had a life expectancy of 47. 40 Fine. According to this theory, a 4-year-old dog would be 28 years old 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. 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