Dog Years

to

Human Years

3 months

6 months

1 year

2 years

4 years

6 years

8 years

10 years

14 years

18 years

20 years

21 years

5 years

10 years

15 years

24 years

32 years

40 years

48 years

56 years

72 years

88-91 years

91-96 years

96-106 years

This chart is based on tooth and bone growth, sexual maturity and other factors related to maturity. It is not exact but is a fairly accurate comparison. Larger breeds of dogs have a shorter life span and smaller dogs have a longer one but a small dog may mature more quickly in the first few years and a large dog more slowly.