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Dog age in human years

Dogs age faster than people, and big dogs faster than small ones. Choose your dog's age and size: the answer comes from a widely used veterinary chart.

Size by adult weight

Result

Choose your dog's age and size and the answer appears here.

Approximate, rounded to whole years.

Dog age chart: 1 to 20 years

Each cell is the human age that matches the dog's age for its size. Colour marks the senior stage.

Still growing Senior
Dog age in human years by size
Dog's age Small <10 kg Medium 10–25 kg Large 25–45 kg Giant 45+ kg
1 yr 15 15 15 12
2 yr 24 24 24 22
3 yr 28 28 28 31
4 yr 32 32 32 38
5 yr 36 36 36 45
6 yr 40 42 45 49
7 yr 44 47 50 56
8 yr 48 51 55 64
9 yr 52 56 61 71
10 yr 56 60 66 79
11 yr 60 65 72 86
12 yr 64 69 77 93
13 yr 68 74 82 100
14 yr 72 78 88 107
15 yr 76 83 93 114
16 yr 80 87 99 121
17 yr 84 92 not in the chart not in the chart
18 yr 88 96 not in the chart not in the chart
19 yr 92 101 not in the chart not in the chart
20 yr 96 105 not in the chart not in the chart

* 17–20 years: the chart continued for small and medium dogs with the same yearly step. Large and giant dogs rarely live that long, so their columns end at 16.

Size groups and life stages

Size goes by the adult male's maximum weight — the same one our breed pages use, and what shops mean by "small breed" or "large breed" food.

Food by life stage

Puppy food is made for a growing dog, so the switch comes when the dog stops growing: small dogs sooner, giants only at about two years. Food for older dogs is usually labelled "senior".

More on puppies, kittens and older pets: Puppy Senior dog

Frequently asked questions

Is one dog year really seven human years?

Not quite. "One dog year equals seven human years" is only an average. A dog matures very fast in its first year: a one-year-old dog matches a teenager of about 15, a two-year-old a person of about 24. After that the years run slower, 4 to 7 human years each, depending on size.

Why do big dogs age faster than small ones?

Big dogs grow for longer and live shorter lives. So from about six years old a big dog's years count faster: a 10-year-old small dog matches a person of about 56, a giant-breed dog of the same age a person of about 79.

When is a dog considered old?

The senior stage is the last quarter of the expected life span. Small dogs reach it at about 10 years, medium dogs at 9, large dogs at 8 and giant dogs at about 6.

Is the calculator accurate for my dog?

It is an approximate guide. The chart groups dogs by size, while each dog's ageing also depends on breed, health and lifestyle. A vet is the best judge of how your dog is ageing.

Sources

2
  1. Size chart: the widely used US veterinary chart by dog weight, based on the American Veterinary Medical Association (AVMA) rule of thumb — the first year about 15 human years, the second about 9, then 4–5 a year. Its weight groups (up to 9, 10–23, 23–45 and over 45 kg) almost match ours.
  2. Life stages: the AAHA Canine Life Stage Guidelines (2019), which define the senior stage as the last quarter of the expected life span.

This is a general guide, not a veterinary assessment: a vet is the best judge of how your pet is ageing.

Have a cat? Cat age in human years