How Old Is Your Dog in Human Years? Conversion Chart Included

How Old Is Your Dog in Human Years? Conversion Chart Included

The old human-to-dog-years metrics is obsolete. Here is how to convert your dog's years in human years today. 

The former human-to-dog-years metric (one year of a dog’s life equals seven years of human life) was never quite accurate. Scientists have developed a better formula to calculate dogs’ aging. Now it has been seen that dogs mature faster than humans at a young age. As a result, the first year of your dog’s existence is about equivalent to 15 human years.

From there, it is entirely dependent on the breed of the dog in question. When it comes to ageing, size and breed are essential considerations. In other words, the number of human years accumulates faster in a dog’s life throughout the dog’s rapid growth to maturity.

How do dogs age?

Follow this protocol for small, medium, and big dogs weighing less than 100 pounds for a more straightforward (and more accurate) way to determine your dog’s age.

As we have established previously, A dog’s first year is equivalent to 15 human years. The second year of a dog’s life is about equivalent to nine human years. Each additional year is roughly equivalent to four or five human years.

So, what makes this technique more precise than the “one dog year equals seven human years” method?

Because it recognizes that not all dog breeds mature in the same way, smaller dogs often live longer than larger dogs thus while a seven-year-old Great Dane may be called a “senior” dog, the same may not be true for a seven-year-old Chihuahua.

Signs of aging in dogs 

Because dogs mature differently, keeping an eye out for indicators that your dog is becoming old is one method to tell when they’ve reached their golden years. Vets consider the last quarter of your dog’s projected life to be his “senior” years, and there’s little question you’ll notice some changes in his health and behavior.

It is critical to recognize that ageing is not an illness. Your dog can be elderly and still be completely healthy, proving that ageing does not have symptoms.’ However, several diseases are more common in old age, and they are frequently misdiagnosed as indications of old age in dogs. We’ll look at some of the most frequent symptoms that older dogs may exhibit.

  • Graying hair
  • Poor eyesight, cloudy eyes
  • Trouble hearing
  • Stiff muscles and joints, arthritis
  • Lower activity level
  • Behavioral changes such as increased anxiety,
  • confusion, accidents in the house, irritability, etc.

Dog life stages: puppy, adult, senior

Understanding the life cycle of a dog helps us to appreciate each stage. It also assists us in comprehending our canine best friend’s behavior and anticipating what is to come in the following stage.



The puppy period begins at birth and lasts until the dog is between the ages of six and eighteen months. They are born deaf, deafeningly deafeningly deafeningly deafeningly deafeningly deafen.

Puppies begin to see and hear at 2-3 weeks of age and are able to stand and move around a bit. They can now learn about their environment since their senses have evolved. This is an excellent time to learn how to interact with people and other pets.

The first eight weeks of a puppy’s life should be spent with its mother and siblings before starting life with its new owner. The dog’s breeder will begin the socialization process, which their new owner will continue while keeping them safe from contagious illnesses prior to vaccines. During this time, it is critical to house train your dog and ensure that they receive the vaccines and care that your veterinarian advises.



The adult period of a dog’s life begins about 18 months for smaller breeds and can last up to 3 years for bigger kinds.

Although dogs still love walks, play, and cerebral stimulation, they grow simpler to manage as their prior training pays off.

It’s a fantastic time to look for activities you and your dog can do together, such as agility lessons or hill walking.



Dogs have a fast life cycle, and they provide us so much delight. It is critical to treasure each stage since a dog’s golden years will begin between the ages of 7 and 10.

Their muzzle will become grey, and they will slow down, preferring a calm saunter than an enthusiastic sprint. More sleep is required, and joint or dental issues are prevalent. It is critical to maintain frequent veterinary appointments.

Larger breeds of dogs usually mature quicker, with an average lifetime of 11-12 years, however some dogs can live for much longer.

How to calculate dog years to human years


Why do smaller dogs live longer than larger dogs?

The bigger the breed, the lower its life expectancy. A big dog, such as a Saint Bernard, has a lifetime of five to eight years, although smaller breeds can live for as long as 12 to 15 years. But why is that ?

According to Professor Elgar, research comparing size and age-related mortality in dogs demonstrates that larger canines die younger because they age more faster than smaller dogs. Large breeds died from cancer at a higher rate than small breeds in the research. Why? Researchers believes that because large breeds develop quicker, they may be more susceptible than tiny dogs to have the aberrant cell proliferation found in cancer. Also, larger dogs may succumb to age-related ailments sooner since they mature faster.

Why do dogs age faster than humans?

The solution is straightforward. Their genetic make-up is distinct. Our canines’ bodies actually have faster metabolisms and work harder than ours. Their hearts even beat faster than a human’s heartbeat. Because of all the extra labor their bodies undergo, they will age and wear out more faster than ours. A one-year-old dog is the equal of a school-age human child. A two-year-old dog is the equivalent of a child on the verge of puberty. But, with good nutrition and activity, we can keep them alive for as long as their short lives will allow. 

Why understanding my dog’s age is important 

Knowing the age of your dog can help you decide what to feed them, what preventative care they may require, and how to provide them the best life possible.

How Can I Extend the Life of My Dog?

Our dogs’ life expectancy is improving as a result of breakthroughs in veterinary science and preventative medicine. We can help our pets live longer, healthier lives by doing the following:

  • Providing a nutritious diet
  • Assisting in the maintenance of a healthy weight.
  • Encourage breed and age-appropriate physical and mental activity.
  • Taking our dogs to the doctor for annual exams and immunizations.
  • Preventive dental treatment is provided.
  • Preventing heartworm, flea, and tick infestations.
  • Keeping them secure from harm’s way.
  • giving lots of love and affection 

dogs in a basket

In the end, despite the fact that the conventional “one dog year equals seven human years” technique has been around for years, it is not particularly accurate. Fortunately, recent study has provided us with a more reliable method of calculating the age of our canines.

Although the arithmetic is more complicated than a simple 1:7 ratio, you can always refer to our dog age to human years chart (or even print it out!) to quickly and simply calculate how old your pet is.