Parson Russell Terrier Age Calculator
Age in human years, adjusted for breed size
The old "multiply by 7" rule doesn't hold up, especially for a small breed like the Parson Russell Terrier. Enter your dog's real age below for a size-adjusted estimate.
| Real age | Human years |
|---|---|
| 1 year | 15 human years |
| 2 years | 24 human years |
| 3 years | 28 human years |
| 5 years | 36 human years |
| 7 years | 44 human years |
| 10 years | 56 human years |
| 12 years | 64 human years |
| 15 years | 76 human years |
Common questions
How do I calculate my Parson Russell Terrier's age in human years?
Parson Russell Terriers mature quickly in their first two years (reaching roughly 24 "human years" by age 2), then age at about 4 human years per real year after that, since they're a small breed. This is closer to how vets actually think about canine ageing than the old "multiply by 7" rule, which was never based on real data and gets more wrong the larger the dog.
Why do bigger dogs age faster than small dogs?
Large and giant breeds mature faster as puppies but have shorter lifespans and age more quickly in their senior years than toy and small breeds. A Parson Russell Terrier is classed as a small breed, which is factored into the numbers above.
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