What age is my dog in Human Years - Dog Years to Human Years
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There are many tables for converting between dog years (age) and human
years (age). Many of them use a very simple calculation e.g. 1 dog year
equals 7 human years. The following converter not only provides much
more accurate information, it identifies the choices that you can make
to help your dog live longer and age more slowly.
Some dogs will live much longer and age much more slowly than others.
Consequently, one might say for one dog that for each calendar year it
ages the equivalent of 10 human years whereas another dog ages only 5
human years. The key factors that determine how long a dog will live
* Size of dog. Generally, small
dogs live much longer than large dogs. On average, small dogs have a
life span 1.5 times that of a large dog. The following table illustrates
* Breed. The breed of dog is a
strong indicator of its life expectancy. In part this is related to the
above factor; large breeds generally have a shorter lifespan than small
breeds. However, even within the same weight category, some breeds live
longer than others. For example, a Doberman Pinscher can easily reach 15
years of age and sometimes 20 despite the fact that it is a large dog
(about 35 kg. or 77 pounds) whereas the smaller Boxer is shorter-lived
and often does not reach 10 years of age.
* Gender: As in humans, on
average females live longer than males. In the case of dogs, the female
generally lives one to two years longer (depending on the breed).
* Neutering. Neutered dogs tend
to live longer than intact dogs. This is mainly due to a reduced risk of
cancer, as cancers of the sex organs are often related to sex hormones,
which are greatly diminished by neutering. Current research indicates
that the sooner the neutering is done the lower the risk of these
* Living conditions. Dogs which
are properly feed and kept, on average, live longer than those that are
not. In extreme cases, much longer. Important factors are: diet,
exercise, living conditions, and medical attention. See the following
section Years versus Healthy Years for discussion.
* Individual characteristics.
Just as some people are born with a strong constitution, so are some
dogs. Consequently, while one can talk about the expected lifespan of a
dog based on the above factors, individual dogs will vary somewhat from
Childhood versus Maturity
It is often said that people live 7 times as long as dogs so each
year of a dogs life is equal to 7 years of a humans life. This is
inaccurate for two reasons:
The longest lived breeds have an average lifespan which is double
that of the shortest-lived breeds. So one can only map years after
considering the breed and other factors described above.
Most breeds (especially the smaller breeds) have a relatively short
childhood compare to people. A small dog with an expected lifespan of 15
years would be mature (sexually and physically) within 1 year. A man
with an expected lifespan of 75 years (the current approximate male life
expectancy in developed countries) would have the equivalent maturity at
15 years of age. Thus the dog reached maturity in 1/15th of its lifespan
whereas the person was mature in 1/5th (15 years / 75 years) of his
lifespan. Consequently, while one can say that the man is living 5 times
as long as the dog, so each dog year is equal to 5 human years, the
first year of life for the dog sees the same amount of development as in
the first 15 or so human years. For this reason, an accurate mapping of
dog years to human years needs to consider factors other than expected
lifespan. The following table does this, considering the different
development stages and the rates at which they are reached (on average)
for the different sizes of dogs.
Dog Age Human Age Converter Table
lbs (9 kg)
Over 90 lbs
(over 41 kg)
The above table is based on averages. However, considering the
additional factors (such as breed) discussed on this page would give a
more accurate forecast for individual dogs. The oldest recorded age for
a dog is 27 years.
Years versus Healthy Years
When asking how long a dog is expected to live, one should keep in
mind the difference between total years and total healthy years. Some
dogs will be healthy and active almost all their lives, while others may
suffer from diseases which dramatically shorten the period of healthy,
active and productive years. Although one cannot predict the health of a
dog with certainty, one can increase the probability of both general
health and long life through careful selection and proper care. Your vet
(and perhaps your local kennel club) can advise on the following
Some breeds are generally healthy while others are known to be prone
to certain diseases (e.g. hip dysplasia, brain tumours, skin allergies).
If you have not yet decided on a specific breed, you may wish to discuss
with your vet the various breeds you are considering and their outlook.
Mixed breeds tend to be healthier (due to greater genetic diversity)
Breed Lifestyle. Each of the breeds have been developed with a specific
purpose in mind, be it sheep herding or family pet. The purpose for
which you are using a dog and the way in which it will be kept should
keep this in mind. In general, working dogs need lots of space and
exercise; without this they will suffer greatly mentally and to a
certain extent physically. On the other hand, a house dog used as a
working or outside dog may suffer disease (e.g. arthritis from cold and
wet) and early death if subjected to severe outside conditions.
Unscrupulous breeders (in particular puppy farms) will breed dogs
without due consideration of their health. Serious respectable breeders
will have their dogs carefully and professionally examined for inherited
and other diseases before considering breeding from them. Consequently,
purchasing a dog from a respected breeder (your local kennel club can
provide a list), while likely more expensive initially, can save a lot
of heartache and medical expenses. Due to the problem of over-breeding,
in many countries it is frequently the case that the most popular breeds
are the least healthy.
Although dogs have different nutritional requirements then people,
like us their health and lifespan will be improved through a suitable
diet, with sufficient but not excessive amounts of food. A dogs
requirements will depend on its age, breed and lifestyle (e.g. very
active dogs need a higher proportion of carbohydrates than less active
dogs). For more information, see Natural and Premium Dog Food.
All dogs require regular exercise (at least several times a week).
The amount and type of exercise will to some extent depend on the breed
and the individual dog. Working breeds (e.g. dogs breed for herding)
generally require much more physical exercise, not only for their
physical health but also for their mental health. It is possible to
over-exercise a dog (particularly if it is very young or is elderly or
if the weather is very hot) but this is rare; most dogs (like most dog
owners) could use more exercise rather than less. In addition to
physical exertion, exercise should also involve a certain amount of
mental stimulation. Varying the route of the daily walk, playing with
the dog, training it or giving it tasks to perform will all provide
Dogs kept outside with inadequate shelter (from cold, wind or rain)
or in poor living conditions (e.g. insufficient space, without clean
water or in unsanitary conditions) will not only have a shorter
lifespan, but will also be prone to early illness. That being said, what
is suitable for one dog may not be suitable for another. For example,
certain long-haired dogs have been breed for very cold conditions while
others (such as the Newfoundland) can easily handle extremely wet and
Dogs should have vaccination against the common canine diseases. In
some parts of the world the presence of certain deadly parasites (e.g.
heartworm) require that dogs receive preventive medication monthly to
ensure that they are not infected. Finally, like people, dogs
periodically require medical treatment for illness or injury, especially
as they get older.