DOG	Human
6 Months	12 years
1 Year	15 Years
2 Years	24 Years
3 Years	28 Years
4 Years	32 Years
5 Years	36 Years
6 Years	40 Years
7 Years	44 Years
8 Years	48 Years
9 Years	52 Years
10 Years	56 Years
11 Years	60 Years
12 Years	64 Years
13 Years	68 Years
14 Years	72 Years
15 Years	76 Years
16 Years	80 Years
17 Years	84 Years
18 Years	88 Years
19 Years	92 Years
20 Years	96 Years
21 Years	100 Years

The older method of 1 year in dog years equals 7 years in human years is outdated. In addition small breed dogs age slightly less (1-2 years) then the above chart, while large to extra large dogs age slightly more (1-2 years) .