informal ) A period of time in the life of dogs, defined such that the average life expectancy of a dog in "dog years" is numerically equivalent to the average life expectancy of a human. A 4 - and a 5
... [مشاهده متن کامل] - year - old dog are about as mature as a human of 28 to 30 years and 33 to 35 years, respectively.
