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How old is your dog in human years? Our calculator uses breed size — not the outdated 7× rule.
| Edad del perro | Pequeño <10kg | Mediano 10-25 | Grande 25-45 | Gigante >45kg |
|---|---|---|---|---|
| 1 año | 15 | 15 | 15 | 14 |
| 2 años | 24 | 24 | 24 | 22 |
| 3 años | 28 | 30 | 30 | 31 |
| 4 años | 32 | 35 | 36 | 40 |
| 5 años | 36 | 41 | 42 | 49 |
| 7 años | 44 | 52 | 54 | 67 |
| 10 años | 56 | 68 | 72 | 94 |
| 15 años | 76 | 96 | 102 | 139 |
Basado en las Directrices de Etapas de Vida Canina de AAHA. Las razas gigantes tienen esperanzas de vida promedio más cortas, por lo que las proporciones se comprimen más rápido.
La popular fórmula de "multiplicar por 7" no tiene base científica. Los perros maduran rápidamente en los primeros 2 años (alcanzando la madurez sexual y el tamaño completo), luego envejecen más lentamente. Nuestra calculadora utiliza directrices de etapas de vida ajustadas por tamaño de: la Asociación Americana de Hospitales Animales (AAHA) y el estudio de epigenética de metilación de UCSD 2020 (referencia Labrador). Las razas más grandes envejecen más rápido debido a tasas metabólicas más altas y división celular más rápida — no por el tamaño en sí.
Directrices de Etapas de Vida de AAHA →The "multiply by 7" rule ignores two biological facts: dogs mature 15× faster in their first year, and small breeds age slower than large breeds after maturity. A 1-year-old dog is not a 7-year-old human — they're closer to 15. By year 5, a Chihuahua (~36 human years) is far younger than a Great Dane (~42 human years).
Source: Wang et al., UCSD (2020)UCSD scientists compared DNA methylation patterns — chemical marks on DNA that change predictably with age — across 104 Labrador Retrievers and humans of all ages. They found dog aging follows a logarithmic curve: rapid in youth, slowing with age. The study (Wang et al., 2020) is the first quantitative epigenetic clock for dogs and reshaped how we understand canine aging.
Source: Wang et al. — Cell Systems (2020)Large breed dogs age at an accelerated rate after their first two years — a 10-year-old small dog is about 60 human years; a 10-year-old giant breed can be 80+. The mechanism isn't fully understood, but research points to faster telomere shortening, higher oxidative stress, and growth-rate-related cellular aging in large breeds.
Source: AAHA Life Stage Guidelines (2021)AAHA defines four life stages: Puppy (0-1 year, rapid growth), Young Adult (1-4 years, peak health), Mature Adult (5-10 years, preventive care focus), and Senior (varies by breed size). Small dogs reach senior status at >10 years; giant breeds at >7 years. Each stage has specific health screening recommendations and nutritional needs.
Source: AAHA Canine Life Stage GuidelinesDatos verificados por petsMetrics utilizando fuentes veterinarias revisadas por pares. Citas: ASPCA, AVMA, AAFP. Última revisión: 2026.
Our calculator integrates two scientific frameworks: the UCSD epigenetic clock study (Wang et al., 2020) that established the logarithmic aging curve for dogs, and AAHA 2021 Canine Life Stage Guidelines that classify dogs into four life stages by breed size. Small breeds (<10 kg) age ~4 human years per dog year after maturity; giant breeds (>45 kg) age ~7-8 human years per dog year. This dual-model approach provides both a human-equivalent age and the clinical life stage your veterinarian uses for health screening decisions.
References: Wang et al. — Dog-to-Human Aging, Cell Systems (2020); AAHA Canine Life Stage Guidelines (2021)— via petsMetrics
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