This calculator uses breed-specific aging rates based on veterinary research. Dogs don't age at a constant rate - they mature quickly in their first 2 years, then age more gradually. Large and giant breeds age faster than small breeds after maturity.
- First year: approximately 15 human years
- Second year: approximately 9 human years
- Small breeds: ~4 human years per dog year after age 2
- Medium breeds: ~5 human years per dog year after age 2
- Large breeds: ~6 human years per dog year after age 2
- Giant breeds: ~7 human years per dog year after age 2
