What is a Dog’s Age in Human Years?

Over the years it is believed that a cat has 9 lives and one dog year equals 7 human years. However, this theory is not science-based. Following a 2019 study, it was reported that different dog breeds age differently and small dogs live longer than large ones. In this guide, we show you what a dog’s actual age is when compared to human years

What Is a Dog’s Age In Human Years?

What Is a Dog's Age In Human Years

According to the American Veterinary Medical Association, the first dog year equals about 15 human years and the second year of a dog’s life equals 9 years. Subsequently, the age of a dog equals approximately four or five years of human life.

Why Do Smaller Dogs Live Longer than Larger Dogs?

Research is yet to explain the reason why smaller dogs live longer than large dog breeds. There seems to be a relationship between the body mass of a dog and its lifespan. In contrast to dogs, other large mammals live longer than small mammals. 

How Old Is A 7-Year-Old Dog In Human Years?

If the first year of a dog equals 15 human years, and the 2nd year equals 9 years, it is estimated that a 7-year-old dog equals 62.1 years old in human life following the American Veterinary Medical Association analysis.

How Old Is A 13-Year-Old Dog In Human Years?

Medium size dogs weighing up to 50 lbs aged 13 ages 74 years in human life following the report made by the American Veterinary Medical Association. 

What Is The Max Age Of A Dog?

The longest age a dog can lead depends on the breed, size, and a whole lot of other factors. Small dogs often live more than 15 to 16 years with a maximum age range of 20 years.

Large and medium-sized dogs on the other hand have a max life of 10 to 20 years. However, giant dog breeds such as mastiffs, have a maximum age range of 7 to 8 years.

Do Dogs Slow Down As They Age?

Yes, dogs slow down in age. Most senior dogs experience reduced activity and mobility as they age. 

Dogs when they age have less stamina, exercise less, and become less active. It’s absolutely normal for your dog to slow down a little as they age. 

Why Do Dogs Age So Fast?

Generally, dogs age faster than humans regardless of their breed and size. This is so because dogs have faster metabolisms and their hearts work harder than that of humans. 

Also, dog lives are accelerated. Humans, for example, don’t start developing teeth until around a month. Dogs, on the other hand, start teething when they’re around 3 or 4 weeks old. That’s a whole lot of extra work.

Following all this extra work, dogs tend to age faster than humans and consequently resulting in them growing up more quickly and thereby living shorter lives. 

Which Dog Has The Longest Life Span?

Although dogs do not live longer than humans, some dogs have a long lifespan. The Australian Cattle Dog has a lifespan of 15 years old. 

However, the Australian Cattle Dog called Bluey holds the record for the longest-lived dog – reaching an incredible 29 years of age. 

What Type Of Dog Lives The Shortest?

Flat-faced dog breeds, including French Bulldogs and Pugs, have the shortest life expectancy, according to a recent study. 

Also, according to vets at the Royal Veterinary College, brachycephalic dogs don’t live as long due to the increased risk of breathing problems, skin fold infections, and spinal disease they face.


Dogs do not live longer than humans, however, when their number of years is compared to the human years, dogs live 10 times longer than humans.


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