About PawYears

PawYears is a free, independent set of pet calculators run by a pet-loving individual. Everything runs in your browser.

Formulas follow published veterinary methods (RER = 70 × kg^0.75 with standard life-stage factors; size-based dog-age charts; theobromine dose thresholds from veterinary toxicology references). They are estimates and no substitute for your veterinarian.