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The 7-to-1 ratio is a convenient, but rough, approximation of canine growth and aging compared to human growth and aging.

What follows is a reproduction of a canine age chart from a vet's office. The first number in each line is the pet's true age, the second number is the "dog years" equivalent for a small breed, and the third number is the equivalent for a large breed dog:

3 months..............6 years...........3 years

6 months.............12 years..........8 years

1 year..................17...................12

2 years.................23...................24

3 years.................27...................30

4 years.................32...................37

5 years.................37...................43

6 years.................41...................50

7 years.................46...................57

8 years.................50...................63

9 years.................55...................70

10 years...............59...................77

11 years...............64...................83

12 years...............68...................90

13 years...............73...................97 (Max. average life expectancy for large dogs)

14 years...............78

15 years...............82

16 years...............87

17 years...............92

18 years...............96 (Max. average life expectancy for small dogs)

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15y ago

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