DogAge

According to the Internet, there are several kinds of conversion tables from dog age to human age. But there is only one kind of table that shows it's source. That is from researches by Fred L. Metzger ,DVM, DABVP.  I could not find original reserch. It might be a paper or some sort of books.

I picked up the table from FPIs page since the table is all same.
http://www.france-property-and-information.com/dog-years-to-human-years-age.htm

*) In this app, the age of Giant Dog in 7th and 10th calendar year does not match as that table. In that table, the age is 56 and 78. But in this app, 57 and 78. Because I wanted the dog's age to change linearly as much as possible to the calendar year.



Calendar YearsUnder 20 lbs (9 kg)20-50 lbs (9-23 kg)50-90 lbs (23-41kg)Over 90 lbs (over 41 kg)
115151412
223242220
328292928
432343435
536384042
640424549
744475056 (※57)
848515564
952566171
1056606678 (※79)
1160657286
1264697793
13687482101
14727888108
15768393115
16808799123
178492104
188896109
1992101115
2096105120

It is difficult to uniformly determine the age of a dog. Some dogs will live much longer and age much more slowly than others. The key factors that determine how long a dog will live are:

- Dog Size. Small dogs live much longer than large dogs.
- Breed. Larger breeds generally have a shorter lifespan than smaller breeds.
- Gender. As in humans, on average females live longer than males.
- Neutering. Neutered dogs tend to live longer than intact dogs. 
- Living conditions. 
- Individual characteristics.


That table shows us that small dogs mature faster than large dogs. But after becoming an adult dog, small dogs are getting old slowly.

That is figured like this:
*) Blue Line ...... smaller dogs, Red Line ...... larger dogs


graph



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