How To Determine How Old A Dog is in Human Years

This was taken from the behavioral guide "Because A Good Dog Is Good To Have" written by Joe White.

7 years for every chronological year (calendar year) is not the measurement used to determine a dog’s age.
If you think about it makes sense...

A dog born today will possibly be leaving his mom and walking into his new home at a mere 8 weeks of age.

The formula is based upon the facts that smaller dogs develop and age more slowly then larger dogs and certain years of a dog's life count for more than others.

What is your dog’s equivalent age to a humans?

ACTUAL YEARS WEIGHT
0-20 lbs 21-50 lbs 50-120 lbs 120+ lbs
3 years 28 yrs 29 yrs 31 yrs 39 yrs
4 years 32 34 38 49
5 years 36 39 45 59
6 years 40 44 52 69
7 years 44 49 59 79
8 years 48 54 66 89
9 years 52 59 73 99
10 years 56 64 80 --
11 years 60 69 87 --
12 years 64 74 94 --
13 years 68 79 -- --
14 years 72 84 -- --
15 years 76 89 -- --
16 years 80 94 -- --
17 years 84 -- -- --
18 years 88 -- -- --
19 years 92 -- -- --
20 years 96 -- -- --