For decades, pet owners believed that 1 dog year equals 7 human years. Modern veterinary science has debunked this rule. Dogs age rapidly during their first two years, after which aging slows down and varies by size.
The Modern Veterinary Aging Model
- First Year: Equivalent to ~15 human years (rapid growth & sexual maturity).
- Second Year: Adds ~9 human years (reaching adult maturity at 24 human years).
- Subsequent Years: Small dogs (+4 yrs/yr), Medium (+5 yrs/yr), Large (+6 yrs/yr), Giant breeds (+7 yrs/yr).
Find your dog's exact human age equivalent and life stage: