One real year is often converted into seven dog years. This is not accurate in the real world, as a real dog's age really isn't that simple to calculate. Veterinarians created a more realistic conversion of real years to dog years, for those truly interested in how long their dog will live, and how it will mature.
puppy months = 10
puppy months = 13
puppy months = 14
1 dog year = 15
From 1 to 18 (real) years of a dog’s life, you can use the following formula to calculate your dog’s real age:
2 to 18 real years = 16 + (4 x d) years old
d = real years
of a dog’s life
So if your dog had lived 7 years, it would be 44 years old.
If your dog is lucky enough to live this long, the scale turns chaotic around now.
real years = 89
real years = 93
real years = 96
real years = 99
real years = 103
real years = 106
So now you know. And the next time someone says 1 real year is 7 dog years, you can say "That's wrong!"
And when they ask you to explain, you can say "I don't remember how the chart goes, because the veterinarians made a chart that isn't easy to remember."
And chances are, they'll think you're a damn liar. And you'll be sad.
Information from http://www.shichon.com/articles/How_old_is_your_dog.htm