Understanding your dog’s age and biological life stage is important in considering age-related health issues such as arthritis, weight control, and declines in hearing or vision. Dogs live with us, share our environments, and suffer from many of the same age-related conditions. These calculations are rough estimates, but they can help you and your veterinarian provide the best care for your dogs as they age. The AVMA considers small dogs “senior” beginning at 7 years of age, whereas larger breeds are considered “senior” at 5 or 6 years of age. Subsequently, each human year is equivalent to 5 years for a dog.Two years of age for a dog equals 9 years of age for a human.One year of age for a medium-sized dog is equivalent to 15 years of age for a human.The American Veterinary Medical Association (AVMA) and the American Kennel Club (AKC) use the following guidelines for calculating a dog’s age: Additional studies will be needed to determine how this calculation might change for different breeds. Small dogs tend to live longer than large dogs. It should be noted that this study looked at one breed of dog, the Labrador Retriever, and we know that breeds age differently. This research highlighted the fact that dogs have a comparatively long twilight period, suggesting that focusing on canine geriatrics could be important and highly relevant to canine health. The comparable life stages break down like this:Ĭomparison of age in dogs and humans. The abbreviation “ln” stands for the natural log. 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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