dog year

Noun

 * 1)  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-year-old dog are about as mature as a human of 28 to 30 years and 33 to 35 years, respectively.  The most common calcuation uses a ratio of seven dog years to one human year.
 * 2) A unit of age relative to the species being considered, defined such that an animal's age in "dog years" is the equivalent age of a dog in calendar years.
 * 1) A unit of age relative to the species being considered, defined such that an animal's age in "dog years" is the equivalent age of a dog in calendar years.

Usage notes
The two definitions complement the two definitions of "human year" respectively. By the first set of definitions, a 6-year-old dog would be described as having an age of 6 human years or 40–50 dog years. By the second set of definitions, the same dog's age would be given as 6 dog years or 40–50 human years.

Translations

 * Japanese:
 * Spanish: años perrunos, años de perro
 * Swedish: hundår