15 human years corresponds to the first year of life for a medium-sized dog. The second year for a dog is about nine years for a human. And after that, every human year would be about five years for a dog.
So a 7-year-old dog would be about 62.1 human-years old.
A general rule of thumb for dog owners is that one year for dogs is equal to seven human years. But new research shows that young puppies age much faster than young humans, so the simple ratio of one to seven years is wrong. A 1-year-old dog is more “like a 30-year-old human,” said one scientist.
With this formula, a 10-year-old dog is equivalent to a 53-year-old human. Using the simple 7:1 ratio, the same 10-year-old dog would be equivalent to a 70-year-old human. All of these calculations are based on the assumption that the average life expectancy of people in developed countries is 80 years.
A dog’s first year is equal to 15 human years. The second year of life of a dog corresponds to about nine human years. Each additional year is about four or five human years.
Smaller dogs tend to live longer than larger ones, but they can mature faster in the early years of life. A giant puppy may initially age more slowly, but will reach middle age by the age of 5. Tiny and toy breeds don’t become “senior” until around the age of 10. Medium-sized pooches fall somewhere in the middle on both counts.
Below is a guide based on breed size: Small breeds are considered older dogs around 10-12 years of age. Medium breeds are considered older dogs at around 8-9 years old. Large and giant breeds are considered older dogs around 6-7 years of age.
A dog’s second year is equal to nine human years (which makes a 2-year-old, medium-sized dog roughly 24 in human years). From the age of three, each dog year corresponds to about five human years.
The simple calculation of a dog’s age
For example, a dog that is 5 years old has 35 “human years“. This isn’t a bad path from a health perspective because it helps us humans realize that our dogs are not the same as children. As pets get older, they need special care and attention.
Depending on its size, a 16-year-old dog corresponds roughly to an 80- to 123-year-old human. Like older people, your dog will move more slowly and sleep more than in his livelier years. He may also be showing signs of cognitive decline.
Assuming that one human year is seven dog years, each hour for us is seven hours for a dog. 1 day for us, 24 hours human time, is 7 days in dog time. A day of the dog corresponds to 3.42 hours of the human.
A 13 to 15 year old dog is roughly equivalent to a 70 to 115 year old human, depending on size and health. As they get older, your dog will find it harder to learn new things. In fact, she will likely be resistant to changes in her environment and routine.
Depending on the breed and size of the dog, ages 10 to 12 are late middle age and beginning of old age.
However, as a general guideline, the American Veterinary Medical Association breaks it down as follows: 15 human years equals the first year of life for a medium-sized dog. The second year for a dog is about nine years for a human. And after that, every human year would be about five years for a dog.