Date & time Pets
Age in dog years
Age in years
Size
In human years 34
15 · 9 · then by size
Life stage adult
The times-seven answer 28
Epigenetic estimate 53.2
Human years per dog year now 5
Large dogs age faster — the reverse of most species
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The first dog year is worth about fifteen human years and the second about nine. After that each year adds four to seven depending on size — four for a small dog, seven and a half for a giant breed.
How to convert to dog years
1 Enter the dog age in its own years.
2 Choose the size band.
3 Read the human-equivalent age and life stage.
4 Compare against the naive times-seven figure to see how far off it is.
Size is the dominant variable and it works the opposite way to most mammals. Across species, larger animals generally live longer — an elephant outlives a mouse by decades. Within dogs the relationship inverts: a Great Dane rarely reaches nine while a small terrier commonly passes fifteen. The reason is not settled, though rapid growth and higher rates of age-related disease in large breeds are the leading explanations.
Questions
No. The first is about fifteen, the second nine, then four to seven by size.
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