How is a dog’s age calculated?
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Expert Answer
A dog’s average lifespan is about 13-18 years, and small breeds generally live longer than large ones. A small dog’s 1 year equals a human’s 16, 2 years 24, 3 years 29, 4 years 34, 5 years 39, 6 years 44, 7 years 49, 8 years 65, then senior.
A large dog’s 1 year also equals 16 human years, but 4 years equals 38, 6 years 52, 8 years 66—aging faster than small dogs.