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Dogs have a higher metabolism than people. They breathe faster, pump blood faster, mature faster, and have a higher normal body temperature ( see Table: Normal Canine Physiologic Values). Young dogs seem to have even more energy than children. However, this high metabolism comes with a shorter life span. A common rule of thumb is that 1 dog year equals about 10 to 12 people years for the first 2 years, and then 4 people years (per dog year) after that ( see Table: Dog Years versus People Years). Actual life span depends on health and size, with small breeds generally living longer than larger ones.