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1.
There are seven dog years for every calendar year. e.g. 25 years = 175 dog years.
You should celebrate your dog's birthday 7 times per year.
by Tha Cuddla January 15, 2005
 
2.
The term dog years refers to a popular conception that household pets—specifically dogs and cats—age seven years for each human year.
For example, a dog of age 9 would be said to be "63 in dog years".
by NewSlang07 June 14, 2007