How Old is Your Dog in People Years?

Beginning at around age 7, many dogs enter their senior years. At this stage, dogs often begin to develop diseases common to their senior-human counterparts, such as diabetes, heart disease, hypothyroidism, kidney disease and cancer. In fact, one out of ten pets that appears healthy, has an underlying disease.1

First, identify your dog's real age using this chart. Then, discuss ways to keep your pet healthy with your veterinarian. [Find out what to expect from a senior dog checkup.]

How old is your dog in people years?

1. Rehm M. Seeing double.Veterinary Economics. 2007;48(10):40-48.

Chart courtesy of Fred L. Metzger, DVM, DABVP. The above ages are intended as general guidelines only. Be sure to ask your veterinarian at what age she or he would consider your pet a senior or geriatric.

If you have any questions or concerns, you should always visit or call your veterinarian – they are your best resource to ensure the health and well-being of your pets.

Dog Age to Human Age Conversion Calculator


Note: This calculator give a rough estimate and may not be accurate. See a veterinarian for age related questions or any other health concerns for your pet.

This calculator determines the age of your dog in equivalent human years or calendar years by specific breed or weight range. This calculator uses dog lifespan data from Wikipedia for the conversion.

Dogs mature at different rates when compared to humans. During the first two years of life, dogs mature rapidly from childhood to adulthood. Typically, dogs will have an equivalent age of approximately fifteen years at one calendar year. At two calendar years, dog will have aged to twenty-four human years. After two years, a canine will age three to five dog years per calendar year.

This calculator allows the user to adjust the rate of aging during the first two years of the dogs life. It defaults to 15 years for the first year and 9 years for the second. The user can adjust these values under the options tab. This is useful to get more accurate results for extremely large or very small pets during the first two years.

Importantly, the conversion for dog years to human years is directly based on human life expectancy. Life expectancy varies by time in history, country and gender (male/female). For example, in 2011 Japan had an overall life expectancy of 83 years and Sierra Leone had a life expectancy of 47. See List of countries by life expectancy for more values. The worldwide average human life expectancy in 2011 was 67.88 years.

This calculator allows the user to adjust human life expectancy used in the calculations. This calculator defaults to sixty-eight years for human life expectancy. The operator can adjust this parameter under the options tab. This is helpful for determining equivalent dog ages in different regions of the world.


  1. Select the dog's breed
  2. Enter the age of the dog in calendar years and months
  3. Optional: Adjust the options for first year aging, second year ageing and human lifespan

Breeds Supported:

This calculator supports the following breeds of dogs: Affenpinscher, Afghan Hound, Airedale Terrier, Akita, Alaskan Malamute, American Cocker Spaniel, American Eskimo Dog, American Foxhound, American Staffordshire Terrier, American Water Spaniel, Anatolian Shepherd Dog, Australian Cattle Dog, Australian Shepherd, Australian Silky Terrier, Australian Terrier, Basenji, Basset Hound, Beagle, Bearded Collie, Beauceron, Belgian Shepherd, Bedlington Terrier, Belgian Shepherd Malinois, Bernese Mountain Dog, Bichon Frise, Black and Tan Coonhound, Black Russian Terrier, Bloodhound, Bluetick Coonhound, Border Collie, Border Terrier, Borzoi, Boston Terrier, Briard, Bouvier des Flandres, Boxer, Boykin Spaniel, Brittany, Bull Terrier, Bulldog, Bullmastiff, Cairn Terrier, Canaan Dog, Cane Corso, Cavalier King Charles Spaniel, Cesky Terrier, Chesapeake Bay Retriever, Chihuahua, Chinese Crested Dog, Chow Chow, Clumber Spaniel, Curly Coated Retriever, Dachshund, Dalmatian, Dandie Dinmont Terrier, Doberman Pinscher, Dogue de Bordeaux, English Bulldog, English Cocker Spaniel, English Coonhound, English Foxhound, English Mastiff, English Setter, English Springer Spaniel, Entlebucher Mountain Dog, Field Spaniel, Finnish Lapphund, Finnish Spitz, Flat-Coated Retriever, French Bulldog, German Pinscher, German Shepherd, German Shorthaired Pointer, German Wirehaired Pointer, Giant Schnauzer, Glen of Imaal Terrier, Golden Retriever, Gordon Setter, Great Dane, Great Pyrenees, Greater Swiss Mountain Dog, Greyhound, Griffon Bruxellois, Harrier, Havanese, Ibizan Hound, Icelandic Sheepdog, Irish Red and White Setter, Irish Setter, Irish Soft-coated Wheaten Terrier, Irish Terrier, Irish Water Spaniel, Irish Wolfhound, Italian Greyhound, Jack Russell Terrier, Japanese Chin, Keeshond, Kerry Blue Terrier, King Charles Spaniel, Komondor, Kuvasz, Labrador Retriever, Lakeland Terrier, Leonberger, Lhasa Apso, Lowchen, Maltese, Manchester Terrier, Mexican Hairless Dog, Miniature Pinscher, Miniature Schnauzer, Neapolitan Mastiff, Newfoundland, Norfolk Terrier, Norwegian Buhund, Norwegian Elkhound, Norwegian Lundehund, Norwich Terrier, Nova Scotia Duck Tolling Retriever, Old English Sheepdog, Otterhound, Papillon, Parson Russell Terrier, Pekingese, Pembroke Welsh Corgi, Petit Basset Griffon Vendeen, Pharaoh Hound, Plott Hound, Pointer, Polish Lowland Sheepdog, Pomeranian, Poodle, Portuguese Water Dog, Pug, Puli, Pyrenean Shepherd, Redbone Coonhound, Rhodesian Ridgeback, Rottweiler, Rough Collie, Saluki, Samoyed, Schipperke, Scottish Deerhound, Scottish Terrier, Sealyham Terrier, Shar Pei, Shetland Sheepdog, Shiba Inu, Shih Tzu, Siberian Huskie, Skye Terrier, Smooth Fox Terrier, Spinone Italiano, St. Bernard, Staffordshire Bull Terrier, Standard Schnauzer, Sussex Spaniel, Swedish Vallhund, Tibetan Mastiff, Tibetan Spaniel, Tibetan Terrier, Toy Fox Terrier, Treeing Walker Coonhound, Tervuren, Vizsla, Weimaraner, Welsh Springer Spaniel, Welsh Terrier, West Highland White Terrier, Whippet, Wire Hair Fox Terrier, Wirehaired Pointing Griffon, Xoloitzcuintle and Yorkshire Terrier.

If you do not see a breed, please send an email to with the missing breed. If you have any information on where the information can be found please include it in the email.

H ow old is a dog in human years?

The common belief is that dogs age seven times faster than human beings. Fortunately, the real number is actually slightly less, meaning our dogs can enjoy more years with us than they would were this myth true. Yet, it is not as simple as them ageing the human equivalent of an easy to remember, round number each year. In fact, dogs age at different rates throughout their lifetime and their size plays an important factor in determining their growth.

How old is your dog in human years? Forget the 7-year rule, study says

When it comes to how old we imagine our dogs to be in human years, most of us use a calculation that says dogs age seven years for every one human year.

So a 1-year-old dog is roughly the same, developmentally, as a 7-year-old human. A 2-year-old dog is equivalent to a young teenager, et cetera.

But a new study by researchers at the University of California San Diego School of Medicine along with other scientists across the country is casting doubt on that math, according to a story by USA Today.

The researchers found that not only is the 1:7 ratio of dog to human years is off, it’s off by a lot.

The study was conducted on 104 Labrador retrievers up to 16 years old. According to its findings, a 1-year-old dog more closely pairs up to a 30-year-old human instead of a 7-year-old child.

“This makes sense when you think about it — after all, a nine-month-old dog can have puppies, so we already knew that the 1:7 ratio wasn’t an accurate measure of age,” said the study’s senior co-author Trey Ideker, professor at UC San Diego School of Medicine and Moores Cancer Center, in a UC San Diego news release.

The research, published July 2 in Cell Systems, is the first that is transferrable across species, and offers veterinarians a tool “for evaluating anti-aging interventions”.

“There are a lot of anti-aging products out there these days — with wildly varying degrees of scientific support,” said Ideker, “But how do you know if a product will truly extend your life without waiting 40 years or so? What if you could instead measure your age-associated methylation patterns before, during and after the intervention to see if it’s doing anything?”

Methylation patterns refer to the formula used to calculate a dog’s age compared to human years. The formula is based on the changing patterns of chemical tags in dogs and humans as they age.

The study found that while dogs age rapidly in their early years, when a dog reaches a certain age the aging process slows.

“A 1-year-old dog is similar to a 30-year-old human. A 4-year-old dog is similar to a 52-year-old human. Then by seven years old, dog aging slows.”

The study was done only on Labrador retrievers, and researchers pointed out that dog breeds can age at different rates.

To calculate your dog’s approximate age, you can use the Google calculator. Go to the calculator and enter 16. Then click the “ln” option to get the natural logarithm (or ln) function. Then input the dog’s age and hit equal (=). When you get that number, add 31 and you get the equivalent of the dog’s age in human years.

So a 7-year-old dog would be roughly 62.1 human years old.

Why does it matter how old our pets are? It’s important to keep in mind that as our pets age, we need to make changes in their nutrition, exercise habits, and even their sleep patterns to help them stay healthy and happy.

As pets age they also become more prone to disease and along with this, more likely to develop common conditions associated with their species and breed. It follows that as a responsible pet owner, when you’re knowledgeable about your dog or cat’s breed and age, the easier it is to prevent and watch for symptoms of decline before they become serious.

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