How the Dog Age Calculator works
Methodology
For dogs at least one year old, the human-age estimate uses the published logarithmic relationship 16 × ln(age) + 31. Life-stage labels are simplified by expected adult size and are not a medical diagnosis.
Frequently asked questions
Is the old “multiply by 7” rule accurate?+
No. Dogs mature much faster early in life, and aging speed varies with size and breed.
Why does size matter?+
Large and giant dogs tend to enter senior life stages earlier than smaller dogs.
Important veterinary note
Calculator outputs are estimates for education and planning. They do not diagnose disease, replace a physical examination, or override advice from a veterinarian who knows your dog.