Dog Age Chart

Dog Age Human Years
2 months 14 months
6 months 5 years
8 months 9 years
12 months 14 years
2 years 20 years
3 years 24 years
4 years 30 years
5 years 40 years
6 years 42 years
7 years 49 years
8 years 56 years
9 years 63 years
10 years 65 years
11 years 71 years
12 years 75 years
13 years 80 years
14 years 84 years
15 years 87 years
16 years 89 years

http://www.dogsindepth.com/dog_age_in_human_years.html

Year 1 14 years
Year 24 years
and each year after add 5 years
Stanley Cohen "How dogs think"