How old is your best friend really? We skip the lazy ×7 and use the real, size-adjusted aging curve — because a Chihuahua and a Great Dane do not age the same. Cute, shareable, instant.
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Because it was never true. Dogs rocket through childhood — about 15 human years in their first year and ~9 more in their second — then settle onto a slower slope that depends on size. Bigger dogs age faster, so each later year counts for more:
These are friendly approximations based on breed-club and veterinary guidance — every dog is its own wonderful exception, and your vet always knows best.
Don't see them? Scroll to the bottom for "Mixed Breed" by size.