Original sentence: A standard (365-day) year of a dog's life, whereas a "human year" is the period of a dog's (or other animal's) life that is claimed to be equivalent to a year of a human being's life.In fact, the aging of a dog varies by breed; dogs also develop faster and have longer adulthoods relative to their total life span than humans.One seventh of a year, or approximately 52 days, primarily used to approximate the equivalent age of dogs and other animals with similar life spans.There are two diametrically opposed definitions:.When these units are used, measurements in both "dog years" and "human years" are often included together, to more clearly indicate which name is used for each unit.When this definition is used, a standard calendar year is known as a "human year"
Edited sentence: (In fact, the aging of a dog varies by breed; dogs also develop faster and have longer adulthoods relative to their total life span than humans.) While the typical convention is to identify the "dog year" as the shorter length of time than the standard "human year" (thus, a 12-year-old dog is said to be 84 "in dog years"), it is also not unheard of to have the 52-day unit be identified as a "human year" and the full 365-day year as a "dog year".A unit of measurement equal to one seventh of a year, or approximately 52 days, is primarily used to approximate the equivalent age of dogs and other animals with similar life spans.When the unit is used, measurements in both "dog years" and "human years" are generally included together, to more clearly indicate which name is used for each unit