Many of you probably grew  with a loyal dog by your side,  

and sure, the biological rhythms of  dogs and humans are not the same:  

When we start to become adults, they  already have a hard time playing fetch.

So, how can you know the life period your dog  is in right now? How can you calculate their  

"human age", so to speak? There is a popular  rule which says that every canine year equals  

seven human years. This rule probably came out  by dividing the average life expectancy of men,  

which is about 77 years, with the life  expectancy of dogs, which is about 11.

However, scientific research has  demonstrated that it isn't that simple:  

Most dog breeds reach puberty between  six to twelve months of age. So, if we  

apply the previous rule we would be talking  about seven human years, which is too soon.

Moreover, some dogs can live more than 20  years, which would equal 140 human years:  

A true record! And we also need to keep  in mind that the life expectancy of a dog  

also depends on their breed, since the  smaller ones live longer than the big ones.

Here we need to explain an important detail:  The difference between chronological age,  

and biological age. The first one is just  the time that has passed between one's birth,  

and one's current age. In contrast, the second one  takes into account other physical factors such as  

physical condition, activity level,  and chronic illnesses. In other words,  

if during your life you've eaten mostly junk  food, and have done little to no exercise,  

then it's very likely that your  biological age will be higher.

Biological age turns out to be  more useful when comparing species:  

By studying the genetic clock, the one  which determines the DNA of each species,  

scientists have created a much more precise  formula: The human age equals 16 times the  

natural logarithm of the dog's age, plus 31.  It seems a bit complicated, right? But don't  

worry – the logarithm is a simple mathematical  function that you can apply using a calculator.

Moreover, if you don't have a calculator at  hand right now, we'll explain it to you in a  

simpler way with a very useful rule: A dog's  first year of life equals 31 human years.  

After that, when the dog's age doubles, the human  years will increase by 11 each time. For instance,  

in eight dog years we are duplicating the  age three times. Eleven multiplied by three,  

plus those first 31 years, gives us 64  human years. If you still feel lost,  

don't worry! We left a couple of links in the  description to calculate your dog's human age.

Now that you know the real age of your dog, then  give them the care and love that they deserve,  

so that they can be by your  side for many more years!  

And by the way, tiktakers, what  is the human age of your dog?