15 Dog Years to Human Years

15 dog years is about 89 human years (AVMA medium dog) or 74 on the UCSD genetic formula.

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Formula

AVMA: 1st year ≈ 15, 2nd year +9 (24 total), each year after +5 (medium dog) · UCSD (Cell Systems, 2019): human age = 16 × ln(dog age) + 31, valid for dogs older than 1 year

Examples

InputResult
15 dog yearsAVMA 89 · UCSD 74
+1 yearAVMA 94 · UCSD 75

Frequently Asked Questions

How old is a 15-year-old dog in human years?

About 89 human years by the AVMA medium-dog guideline, or 74 by the UCSD genetic formula. A 15-year-old dog is about 89 human years (AVMA medium dog).

Why do the two methods give different numbers?

The AVMA curve is based on life-stage milestones (puppy, adult, senior); the UCSD formula is fitted to DNA methylation clocks. They agree on the early years and diverge for seniors, both are shown so you can judge.

Does breed size matter?

Yes. Small dogs live longer and age more slowly after year two (about +4 human years per dog year); giant breeds age faster (+6 or more). This calculator uses the medium-dog +5 curve.

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