CollarChartHarness, collar and crate sizes that fit the dog you actually have.

A 14-year-old Italian Greyhound in human years

Italian Greyhound at 14 years
72human years
small breed — senior, roughly 93% through a typical lifespan
Italian Greyhound — small breedpuppyadultseniormedian 1514 yr72 human years (AVMA) · 73 (epigenetic clock)93% through a typical lifespan
AVMA size-based15 for year one, 9 for year two, then 4/year for a small breed72human years
Epigenetic clock16 × ln(age) + 31 — Wang et al. 2020, calibrated on Labradors73human years
Difference between the twothe two methods agree closely at this age+1years
Life stagesenior
Size class7–14 lb — larger dogs age fastersmall
Typical lifespanmedian for small breeds15years
Share of life so far93%
Typical years remaininga population median, not a prediction about your dog1years

Notes

  • Italian Greyhound. 14 to 15 years. Thin bone means leg fractures from ordinary jumping, most often between one and two years old, and dental disease is severe enough to shorten life if ignored.
  • Bigger dogs age faster, which is backwards from mammals in general and is the reason no single conversion table works. A small breed adds about 4 human years per dog year after the second birthday; a small breed adds 4, a giant breed 6.5. The old "multiply by seven" rule gets a one-year-old badly wrong in one direction and a fifteen-year-old badly wrong in the other.
  • The two methods land within 1 years of each other here, which is about as close as they get.
  • At senior stage, twice-yearly vet visits are the standard recommendation rather than annual ones. Most of what shortens a senior dog's remaining time — dental disease, arthritis, kidney and heart changes — is manageable when found early and expensive when found late.
  • Lifespan figures are population medians from veterinary data, not a forecast. Individual dogs of every size routinely live well past them.

Two answers, and neither is simply wrong

72 human years by the AVMA size-based table: 15 for the first year, 9 for the second, then 4 a year for a small breed.

73 human years by the epigenetic clock published in Cell Systems in 2020 — human age = 16 × ln(dog age) + 31, derived from DNA methylation.

They differ by 1 years here. The epigenetic clock is a measurement rather than a convention and captures early life remarkably well, but it was calibrated on Labradors and cannot see breed size. The AVMA table does account for size but is a smoothed consensus.

Bigger dogs age faster

This is backwards from mammals in general, and it is why no single conversion works. A small breed adds about 4 human years per dog year after the second birthday; a small breed adds 4, a giant breed 6.5.

The old "multiply by seven" rule gets a one-year-old badly wrong in one direction and a fifteen-year-old badly wrong in the other.

Where this dog is

Life stage: senior. Roughly 93% through a typical lifespan for a small breed, with a median of 15 years.

Those are population medians from veterinary data, not a forecast — individual dogs of every size routinely live well past them.

The one thing that moves the number

Weight. A landmark Purina lifetime study found dogs kept lean lived about 1.8 years longer than littermates fed 25% more. That is a larger effect than almost anything else within your control.

Nearby sizes

Read more