One size fits all – Another commonly used system suggests that the first two years equal 10.5 years each, with subsequent years equaling four human years. This is considered to be inaccurate on two scores, because the first year or two years represent some 18–25 years, and the ratio varies with size and breed. Popular myth – It is popularly believed that one dog year equals seven human years. 
Graph of dog age versus equivalent human age, grouped by dog size However, regardless of which set of terminology is used, the relationship between dog years and human years is not linear, as the following section explains. By this terminology, the age of a 6-year-old dog is described as 6 dog years or 40–50 human years, a reversal from the previous definition.
The other common system defines "dog years" to be the actual calendar years (365 days each) of a dog's life, and "human years" to be the equivalent age of a human being. Under this system, a 6-year-old dog would be described as having an age of 6 human years or 40–50 (depending on the breed) dog years. 
One common nomenclature uses "human years" to represent a strict calendar basis (365 days) and a "dog year" to be the equivalent portion of a dog's lifetime, as a calendar year would be for a human being. However, there are two diametrically opposed ways in which the terms are defined: The terms dog years and human years are frequently used when describing the age of a dog. A 13-year-old dog of a small breed, such as this Cairn Terrier, would be approximately 68 in equivalent human age, whereas a large breed would be around 96.
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