Dog Age FAQs: Senior Care, Longevity & Life Stages
Expert answers to dog aging questions — life stage transitions, senior care needs, longevity factors, and when to start geriatric screenings. Based on AAHA and UCSD research.
最終更新日：July 2026。ソース：AAFCO, AAHA, WSAVA, AAFP, ASPCA
このページは 7 のよくある質問を集約しています ガイドと計算機からのものです。
Dog Age Calculator
Dog Age Calculatorに移動 →How do I calculate my dog's age in human years?
Our dog age calculator uses AAHA 2023 life stage guidelines adjusted by breed size. Small dogs age slower than large dogs — a 5-year-old Chihuahua is roughly 36 human years, while a 5-year-old Great Dane is about 42. The old 'multiply by 7' rule ignores rapid early maturation and size-dependent aging rates.
ソース: Dog Age Calculator
Why is the 7× rule inaccurate for dogs?
The "multiply by 7" formula ignores rapid maturation in the first 2 years and size-dependent aging rates. A 1-year-old dog is roughly 15 human years, a 2-year-old is about 24, then each year adds 4-7 human years depending on breed size. Our calculator accounts for breed size per AAHA guidelines and UCSD methylation research.
ソース: Dog Age Calculator
What are the dog life stages?
AAHA defines four canine life stages: Puppy (0-1 year), Young Adult (1-4 years), Mature Adult (5-10 for small breeds, 5-7 for large breeds), and Senior (varies — small dogs >10 years, giant breeds >7 years). Each stage requires different nutrition, exercise, and health screening protocols.
ソース: Dog Age Calculator
Why do small dogs live longer than large dogs?
The leading theory is accelerated aging in large breeds: large-breed cells divide faster and accumulate more oxidative damage. UCSD's epigenetic clock study found that large dogs' DNA methylation patterns change faster after age 2, equivalent to aging ~1.3× faster per year. Cancer accounts for ~50% of giant breed deaths vs. ~25% in small breeds.
ソース: Dog Age Calculator
Senior Dog Care Guide
Senior Dog Care Guideに移動 →When should I start senior dog care?
Start transitioning to senior care when your dog reaches the "Mature Adult" stage: around age 7 for giant breeds (Great Danes, Mastiffs), age 8-9 for large breeds, and age 10-11 for small and toy breeds. Key changes: biannual vet exams, blood work screening (kidney, liver, thyroid), joint supplements, and adjusted nutrition.
What health screenings do senior dogs need?
AAHA recommends biannual exams for senior dogs with blood work (CBC, chemistry panel, thyroid), urinalysis, blood pressure, and dental assessment. Additional screenings may include X-rays for arthritis, echocardiograms for heart murmurs, and eye exams for cataracts. Early detection of chronic kidney disease, diabetes, and cancer significantly extends quality of life.
Dog Years vs Cat Years Comparison
Dog Years vs Cat Years Comparisonに移動 →How does dog aging compare to cat aging?
Dogs age faster than cats in early life — a 1-year-old dog is ~15 human years while a 1-year-old cat is also ~15. But large dogs age significantly faster after age 5. A 10-year-old Great Dane (~70 human years) vs a 10-year-old cat (~56 human years). The difference is most pronounced in giant breeds.
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