What is the equivalence between the age of a dog and the age of a man?


To assess the equivalence between the age of a dog and the age of a man, it was long thought that it was sufficient to multiply by 7 the age of the animal. This formula could have been founded if the relationship between these two ages had been linear. But it is far from being the case. On the contrary, it is necessary to take into account the evolution of the dog according to its breed, and that is not an easy task. Let’s do a check in.

Dog / human age equivalence: points to consider

There are real differences between small breed, medium breed, large breed and even giant breed dogs because depending on their category, their life expectancy varies widely.

Whatever the type of dog, by the end of its first year of life, it is already 10 to 15 times “older” than a 1 year old child. But this time it is in the small breed dog of the Chihuahua type that we see the biggest difference since the age of maturity is significantly advanced compared to that of a giant breed dog like the Great Dane for example. . That’s not all: the dog ages more or less quickly from one year to the next. Thus, the data to be considered are:

  • The size (breed) of the dog,
  • His life expectancy,
  • The age at which he reaches sexual maturity.

These are of course only approximations, because what also weighs in the balance is the health of the animal linked to its lifestyle. He is also more likely to live in good health and to stay “young” longer if he is regularly seen by a veterinarian. The sterilization can also help a dog to aging less quickly

Examples of dog age vs human age equivalences

No need to engage in approximate calculations, and in any case we do not multiply the age of his dog by 7 at all because the result obtained would be far from reality. You just need to use a online estimate form which takes into account the type of dog and its real age to give an equivalence in human age. You can also find on the Internet equivalence tables very informative.

The following examples give a precise idea of ​​the equivalence between the age of a dog and the age of its owner.

Dog size

Dog’s age

Human age

Small dog whose adult weight is less than 15 kg

1 year

20 years

5 years

40 years

8 years

52 years

12 years

68 years old

18 years old

92 years old

Medium-sized dog whose adult weight is at least 15 kg and less than 45 kg

1 year

18 years old

5 years

45 years old

8 years

63 years old

12 years

85 years old

18 years old

128 years

Large dog whose adult weight is over 45 kg

1 year

16 years old

5 years

49 years

8 years

76 years old

12 years

115 years

18 years old

168 years

The signs of senescence do appear at different ages depending on whether the dog is small or large. The slow degradation due to biological aging process occurs much earlier in larger dog breeds even if they age less quickly at the start of their life than small breed dogs. This is the reason why mutual health insurance for pets fix a age limit beyond which they no longer always agree to insure the animal.