With their gray muzzles and wise expressions, senior dogs are especially lovable and poignant. Whether measured in human years or dog years, as our dogs mature and age there is beauty and charm at every step along the way. The Dog Aging Project is studying the aging process in dogs, using geroscience research to “delay aging and promote healthy longevity.” Scientists plan future studies to better explain the link between growth and mortality.Ĭanine gerontology is a burgeoning field of science, as dog lovers are looking to not only extend the time they have with their pets, but to improve the quality of that time. The reason why is still unknown, though Kraus puts forward several possibilities, including that larger dogs may succumb to age-related illnesses sooner and that the accelerated growth of large dogs may lead to a higher likelihood of abnormal cell growth and death from cancer. Scientists concluded that every 4.4 pounds of body mass reduced a dog’s life expectancy by about a month. Large dogs age at an accelerated pace, and “their lives seem to unwind in fast motion,” according to researcher Cornelia Kraus, an evolutionary biologist at the University of Göttingen in Germany, speaking to Inside Science. So why do small dogs have a longer average life span than large breeds? Generally speaking, large mammals, like elephants and whales, tend to live longer than small ones, like mice. This phenomenon has baffled scientists for years, and research has yet to explain the relationship between body mass and a dog’s lifespan. Why Do Smaller Dogs Live Longer than Larger Dogs? Instead, there are three main sources for data on their longevity: pet-insurance companies, breed-club surveys, and veterinary hospitals. The National Center for Health Statistics doesn’t keep records for dogs. Again, keep in mind that these are rough estimates. Therefore, a 4-year-old Great Dane would already be 35 in human years. The average life expectancy, according to the Great Dane Club of America, is about 7–10 years. Contrary to popular belief, dogs do not age at a rate of 7 human years for each year in dog years.”Īn example would be the Great Dane. The ‘senior’ classification is based on the fact that pets age faster than people, and veterinarians start seeing more age-related problems in these pets. Larger-breed dogs tend to have shorter lifespans compared to smaller breeds and are often considered senior when they are 5 to 6 years of age. There are many several factors to consider, so it’s not possible to pin it down precisely, but the AVMA says: “Cats and small dogs are generally considered ‘senior’ at seven years old, but we all know they’ve got plenty of life left in them at that age. How Do Researchers Come Up With Those Numbers?
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