How old is a 2 year old Yorkie in human years
Dog Years Calculator
Quick navigation:
- Using the dog years calculator
- How do dog years work?
- Dog years to human years formula
- Dog age chart
- Limitations of the dog age calculator
- The myth of multiplying dog age by seven to get the human age
- How many dog years are in a human year?
Using the dog years calculator
This dog age calculator makes it easy to answer the question how old is my dog in human years? If you know your dog's age, just enter it as either a number of years or months. If you don't know the age, but know the dog's birth date, enter it instead and our tool will calculate the dog age in calendar years for you. Finally click "Calculate Human Years".
The output of the calculator is the number of human years, and the equivalent human age in years and months. The tool converts dog years in human years using the formula below.
How do dog years work?
The idea of 'dog years' and 'human years' is to more easily assess what stage of life your dog is: puppy, junior, adult, mature, senior, or geriatric. While different animal associations and veterinary associations might have charts and guidelines for that, for regular people it is much easier to understand when the dog's age is converted to the age of a human in an equivalent phase of physical development. For example, 9 years in dog years are equal to 66 human years, meaning that a 9-year old dog is roughly equivalent to a 66-year old person. Some use the term 'dog years' to mean 'human age equivalent years' while the scientific literature prefers the term 'human years' as more accurate.
The application of this idea is mainly in veterinary work, but it can also help dog owners appreciate the stage of life their pet is in, the physical difficulties that may entail, and so on. Both human and animal life spans have increased over time due to superior care and the availability of more economic resources which can be dedicated to animal healthcare. Continued improvements are unlikely with the current state of medical science, but should they become a reality, we would need to change the way we convert dog years to human years.
Dog years to human years formula
The dog age to human age conversion formula we use in this dog years calculator is based on research by Wang et al. (2020) [1]. Its derivation comes from the comparison of human DNA methylation changes with those of dogs. Methylation is experienced by mammalian genomes as they age and can serve as a sort of epigenetic clock. It is linked with life spans of various species and hence can serve as a model of aging.
In the equation above, HumanAge is the age equivalent of a human in years whereas DogAge is the age of the dog measured in calendar years. ln is the natural logarithm function. For example, a 12 year old dog will be nearly 71 in human years.
Dog age chart
The dog years chart below presents the equivalent human age for a given dog age. Since it was calculated using this dog years to human years calculator, it is subject to the same limitations as the tool itself.
The chart can be used to tell how old is 4 in dog years, or the reverse, e.g. what is 9 years in dog years.
Limitations of the dog age calculator
Since the research used to construct this tool was carried on 104 Labrador retrievers spanning a 16-year age range, it may have lower validity for other dog breeds. It should be used with caution for breeds that exhibit a typical lifespan much different than that of Labrador retrievers. E.g. it might work well for a Boxer, a Pitbull or a German Shepherd, but it will probably slightly overestimate the human equivalent age of a Yorkie, a Labradoodle, a Maltipoo, a Cockapoo, a Shetland sheepdog, or a Jack Russell.
Additionally, the dog years equation does not support dog age less than approximately 1.8 months. For this reason a dog age below 1.8 months is calculated as 0.3 human years, which should serve as a rough approximation.
The myth of multiplying dog age by seven to get the human age
For many years the standard advice was that in order to get the human years equivalent, one needs to simply multiply the dog age by seven. So a two year old dog would have a human age equivalent to a 14-yeard old adolescent. However, this advice was never scientifically backed. For example, most dogs would reach sexual maturity between six and twelve months old, well before the two-year mark suggested by this simple approach.
Some believe that this basic advice was given to dog owners so they would remember they need to bring in their companions for a regular check up at the veterinarian office at least one a year. If one dog year is equal to seven human years, that actually sounds like conservative advice.
How many dog years are in a human year?
Understanding the non-linear monotonic relationship between dog years and human years means asking questions like how many dog years are in a human year is meaningless. There is no single number which answers that question. To answer it, one needs to present the functional relationship across the entire life spans of both dogs and humans, just like in the dog age chart.
References
1 Wang T. et al. (2020) "Quantitative Translation of Dog-to-Human Aging by Conserved Remodeling of the DNA Methylome", Cell Systems, DOI: 10.1016/j.cels.2020.06.006
Yorkie Age Equivalent
Lets explore some important milestones your Yorkie will go through from early life through their senior years.
3 Weeks
At 3 weeks, a newborn Yorkie will be beginning to open his eyes. If your Yorkies tail was docked after birth, it will be fully healed.
4 Weeks
By now, your Yorkie puppy will have fully learned to walk, so you can expect them to be out there exploring the world. Also, weaning them off of a liquid diet and onto a solid diet will begin.
8 Weeks
A Yorkie puppy will be legally allowed to be given to a new owner at the age of 8 weeks and separated from his mother. If training hasnt yet started, then now is the time. By now, your Yorkie pup should be on a fully solid diet of puppy food, and completely weaned from his mother.
At this stage and for the next several months, you will spend more hands-on time taking care of your puppy. That means its time to start buying appropriate soft puppy toys and youll be ready to get a puppy leash to help your Yorkie explore the world.
3 to 6 Months
Youll notice your Yorkies ears begin to pop up during the 3 to 6 month period. The time this will happen can differ from pup to pup.
4 to 7 Months
At any point within the 4 to 7 months of age bracket, your Yorkie will begin teething. Make sure you have appropriate teething toys at home!
5 Months
While you may have seen the perfect bite come along by now, its not uncommon to see it go again around the 5 month point. Owners should be very aware of a Yorkies bite going awry, as a good bite is crucial to proper chewing and digestion, and overlapping teeth can be an ideal place for bacteria to grow.
5 to 9 Months
Around about now a female Yorkie will tend to enter her first heat. Spaying your Yorkie is highly recommended if youre not looking to breed. Spaying will also greatly cut down any potential of developing mammary or ovarian cancer.
1 Year
At 1 year of age, your Yorkie has left puppydom and entered adulthood. You can now introduce your Yorkie to adult small-breed kibble.
8+ Years
Your Yorkie is now considered a senior. Care must be taken to change dog food to a senior variety, and lots of other changes should be made, such as increased visits to the vet and extra care around the house.
How Old is Yorkshire Terrier in Human Age? Yorkshire Terrier Age Calculator
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Converting Yorkshire Terrier Age to Human Age
A very long time ago, people thought that one year in a dog`s life was equal to 9 human years. A record of this assumption could be found on a 1268 inscription on the floor of Westminister Abby in the United Kingdom.
Then, an update happened, and people started believing that one year in a dog`s life was equivalent to 7 human years.
However, if you think about it really well, converting your dog`s age to its human age by multiplying your dog`s age by 7 or by 9 does not make any sense.
To debunk the 1 dog-year to 7 human-years myth, let us take a 1-year-old Yorkshire Terrier as an example. A one-year-old Yorkshire Terrier is mature enough to make puppies. However, a seven-year-old human is nowhere close to being capable of having babies.
The moral of this is that the relationship between aging in Yorkshire Terriers and aging in humans is not simple. In scientific terms, the aging relationship between Yorkshire Terriers and humans is not linear. So, you cannot just convert your Yorkshire Terrier`s age to its equivalent human age by just multiplying by a single number.
You need a special table or calculator to convert your Yorkshire Terriers age to its human age. This article provides you with the table/calculator that you need for this conversion.
A Brief History of the Science behind Dog Age to Human Age Conversion
In 1953, a French researcher by the name A. Lebeau published a paper to show that the relationship between a dog`s age and a human`s age is not constant over the lifespan of the dog. Lebeau`s paper was titled L`age du Chien et celui de l`Homme. Essai de statistique sur la mortalite canine (The age of the Dog and that of the Man. Canine Mortality Statistical Essay).
To convert a dog`s age to its human age, Lebeau divided the stages of a dog`s life roughly into puberty, adulthood, old age, and end of life. He then proposed a series of numbers (multipliers) that can be used to multiply a dog at each of these different life stages to obtain the dog`s equivalent human age. This means there is a multiplier for converting a dog`s age at puberty to its equivalent human age, a different multiplier for converting a dog`s age at adulthood to its human age, and so on.
Building on Lebeau`s work, scientists also realized that one size does not fit all when it comes to converting a dog`s age to its equivalent human age. This is because small-sized dog breeds live longer than giant-sized dog breeds. Hence, smaller dog breeds age slower than giant breeds. Thus converting a small-sized dog breed age to its human age requires a formula that is different from the formula for a giant-sized breed.
Therefore, in 1997, researchers from Purdue University developed a dog age to human age conversion method that extended Lebeau`s work. Their method took dog breed size into account in converting a dog`s age to its human age equivalent.
In this article, we have developed a dog-age-to-human-age calculator and table that lets you convert your Yorkshire Terrier`s age to its human age based on the method developed by Purdue University veterinarians.
Also, recently in 2020, researchers from the University of California, San Diego (UCSD) developed what they called a better method for converting a dog`s age to its human age.
These scientists at UCSD compared the DNAs of humans and the DNAs of Labrador Retrievers at different ages to develop a mathematical relationship between a dog`s age and a human`s age.
In this article, we have also developed a table and a calculator that lets you convert your Yorkshire Terrier`s age to its human age based on the method developed by the scientists from UCSD.
Finally, we developed our method and its calculator that lets your convert your human age to your Yorkshire Terrier`s age. You are definitely not as old as you think (in Yorkshire Terrier`s years).
In summary, this article contains:
- Yorkshire Terrier-age-to-human-age calculator based on the method developed by Purdue University Researchers.
- Yorkshire Terrier-age-to-human-age calculator based on the method developed by UCSD Researchers.
- Human-age-to-Yorkshire Terrier-age calculator based on the method developed by us.
How to Convert Your Yorkshire Terrier`s Age to Human Age
In 1997, researchers from Purdue University developed a method for converting a dog`s age to its human age. Their method was based on the 1953 work of the French Veterinarian, A. Lebeau that we discussed above.
Researchers from Purdue University took Lebeau`s work further by taking into account two important factors to develop a more accurate method for converting a dog`s age into its human equivalent age:
- The size of the dog: Smaller dog breeds live longer than larger breed dogs
- The lifespan of the dog: Dog breeds that live longer lives will age slower than dog breeds that live shorter lives
The average lifespan of the Yorkshire Terrier is 12.6 years.
Yorkshire Terriers are tiny-sized dogs. Yorkshire Terriers weigh 4 to 6 pounds.
The method developed by the Purdue University veterinarian researchers took into account the lifespan and size of Yorkshire Terrier in converting Yorkshire Terrier age to human age.
The researchers used data on the lifespan and weight of 5,608 mixed breed dogs and 17,927 purebred dogs to develop their method for converting the ages of dogs (of different breed sizes and lifespans ) to their equivalent human ages.
The calculator below lets you convert your Yorkshire Terrier`s age to its human age based on the Purdue University method. Just enter your Yorkshire Terrier`s age in the calculator and it will compute your Yorkshire Terrier`s human age. If you do not know your Yorkshire Terrier`s exact age, enter an approximate age in the calculator.
Also, the table below shows how old your Yorkshire Terrier is in human years based on the method developed by the researchers.
Note that your Yorkshire Terrier`s human age changes day by day. Therefore, always check back to use the calculator to find your Yorkshire Terrier`s up-to-date human age.
Yorkshire Terrier Age to Human Age Calculator (Purdue Uni. Method)
Below is a Yorkshire Terrier age to human age calculator that is based on the methods developed by researchers from Purdue University.
The calculator will tell your Yorkshire Terrier`s human age based on your Yorkshire Terrier`s dog birthday. Also, the calculator will tell you which day is your Yorkshire Terrier`s human birthday! Try it out!
| Yorkshire Terrier Age (Years) | Human Age (Years) |
|---|---|
| 1 | 12 |
| 2 | 18 |
| 3 | 24 |
| 4 | 30 |
| 5 | 35 |
| 6 | 39 |
| 7 | 44 |
| 8 | 48 |
| 9 | 51 |
| 10 | 55 |
| 11 | 58 |
| 12 | 62 |
| 13 | 65 |
| 14 | 69 |
| 15 | 73 |
| 16 | 77 |
How Long Do Yorkshire Terriers Live in Human Years?
The average lifespan of the Yorkshire Terrier is 12.6 years. In human years, the Yorkshire Terrier lives for 64 years.
How Old is 5-year-old Yorkshire Terrier in Human Years?
A 5-year old Yorkshire Terrier is 35 years old in human years.
How Old is 7-year-old Yorkshire Terrier in Human Years?
A 7-year old Yorkshire Terrier is 44 years old in human years.
How Old is 9-year-old Yorkshire Terrier in Human Years?
A 9-year old Yorkshire Terrier is 51 years old in human years.
How Old is 10-year-old Yorkshire Terrier in Human Years?
A 10-year old Yorkshire Terrier is 55 years old in human years.
Your Yorkshire Terrier`s Age to Human Age (UCSD Method)
The limitation of this method is that it was derived from a study of Labrador Retrievers. This method is accurate if applied to a dog breed with a similar lifespan as the Labrador Retrievers. Labrador Retrievers have a lifespan of 12 years.
In 2020, the researchers from the University of California San Diego (UCSD) developed a method for converting a dog`s age to its human age is based on what is called epigenetics. Epigenetics is the study of how the way an animal lives changes the animal`s DNA.
Using the methods of epigenetics, one can learn about a person`s life or a dog`s life simply by scrolling through the DNA of the dog or the human (take that Instagram!).
With the techniques of epigenetics, scientists can look at a man`s, a dog`s, or a mouse`s DNA to figure out how old the man, the dog, or the mouse is, without anyone telling the scientist when the man, dog, or mouse was born. This is pretty cool.
This is kind of similar to counting the teeth of a horse to determine the age of a horse or counting the rings in a tree to determine the age of the tree, etc. However, the techniques used in epigenetics are way more accurate than crude methods of estimating age by counting teeth or rings. This is because the methods of epigenetics look at a dog`s DNA.
Furthermore, one can match the signatures of aging seen in a dog`s DNA to the signature of aging seen in a human`s DNA to convert a dog`s age to its equivalent human age.
According to the researchers, converting a dog age to human age makes sense because dogs (especially Yorkshire Terriers) and humans live together and share similar lifestyles. Our Yorkshire Terriers are exposed to the same environment as we do. We treat our Yorkshire Terriers as we treat ourselves.
We take our Yorkshire Terriers to the animal doctors just as we humans take ourselves to doctors for health checkups or treatment when sick. We give our Yorkshire Terriers vaccines and medications, human-style. In short, Yorkshire Terriers have similar lifestyles as humans do. Therefore, a dog`s life and human life will definitely mirror each other.
No other animal species has such an intimate relationship with humans as dogs do. Dogs and humans have come a long way together.
Furthermore, dogs and humans go through similar well-defined life stages: birth, baby stage, young age stage, adolescence, adulthood, and old age. Therefore, converting a dog`s age to a human age is not a wild idea.
Based on their study of 104 Labrador Retrievers, the UCSD researchers came up with a neat formula for converting dog age to human age. Interestingly, this formula applies to aging in mice as well, and the researcher believes that the formula will apply to all dog breeds, and just not the Labrador dog breed that they used in their study.
The formula they came up with is this: human_age = 16 ln(dog_age) + 31
Use the calculator or table below to convert your Yorkshire Terrier`s age to its human age based on this formula. For the calculator, simply enter your Yorkshire Terrier age in the calculator to get its human age and its human birthday.
Yorkshire Terrier Age to Human Age Calculator (UCSD Method)
Below is a Yorkshire Terrier age to human age calculator that is based on the methods developed by researchers from UCSD.
| Yorkshire Terrier Age (Years) | Human Age (Years) |
|---|---|
| 1 | 31 |
| 2 | 42 |
| 3 | 48 |
| 4 | 53 |
| 5 | 56 |
| 6 | 59 |
| 7 | 62 |
| 8 | 64 |
| 9 | 66 |
| 10 | 67 |
| 11 | 69 |
| 12 | 70 |
| 13 | 72 |
| 14 | 73 |
| 15 | 74 |
| 16 | 75 |
| 17 | 76 |
| 18 | 77 |
How Old Are You in Yorkshire Terrier Years?
Since new research from UCSD has given us the formula to convert Yorkshire Terrier age to human equivalent age, then it is possible to reverse this formula to convert human age to Yorkshire Terrier age. Therefore, here, we have developed the reverse formula that allows you to convert your age to your Yorkshire Terrier`s equivalent age. Enter your age below to calculate your age in Yorkshire Terrier years.
Human Age to Yorkshire Terrier Age Calculator
| Your Human Age (Years) | Yorkshire Terrier Age Equivalent (Months) |
|---|---|
| 2 | 0 years, 1 months |
| 6 | 0 years, 2 months |
| 10 | 0 years, 3 months |
| 14 | 0 years, 4 months |
| 18 | 0 years, 5 months |
| 22 | 0 years, 6 months |
| 26 | 0 years, 8 months |
| 30 | 0 years, 11 months |
| 34 | 1 years, 2 months |
| 38 | 1 years, 6 months |
| 42 | 1 years, 11 months |
| 46 | 2 years, 6 months |
| 50 | 3 years, 3 months |
| 54 | 4 years, 2 months |
| 58 | 5 years, 4 months |
| 62 | 6 years, 11 months |
| 66 | 8 years, 10 months |
| 70 | 11 years, 5 months |
| 74 | 14 years, 8 months |
| 78 | 18 years, 10 months |
| 82 | 24 years, 2 months |
Conclusion on Yorkshire Terrier Age to Human Age
As your Yorkshire Terrier grows older, you will start seeing changes in your Yorkshire Terrier. Some of the common signs of aging in Yorkshire Terrier are Fading of Yorkshire Terrier Coat Color, Graying of hair, health problems like hearing loss and loss of sight, lower activity level, bad Yorkshire Terrier behavior like having accidents in the house, irritability, etc.
When your Yorkshire Terrier starts to show signs of aging, make sure you empathize with your Yorkshire Terrier. You may also consider getting health insurance for your Yorkshire Terrier so that you can better handle the cost associated with taking care of a senior Yorkshire Terrier.
