How-to · Pet Age
How to Calculate the Real Biological Age Equivalent of Domestic Pets
Quick answer
To find a pet's true human age equivalent, replace the outdated "multiply by 7" rule with a non-linear biological model that accounts for rapid development during their first two years of life.
Step by step
- Replace the outdated "multiply by 7" rule with a non-linear biological model that accounts for rapid development during their first two years of life
The Non-Linear Mammalian Maturation Scale
Modern veterinary science shows that domestic dogs and cats mature quickly early on: the first year of a dog's life equals roughly 15 human years, the second year adds about 9 years, and each subsequent year settles into a stable addition of roughly 4 to 5 human years depending on the animal's weight and breed size.
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