CALCULATING CANINE AGE IN EQUIVALENT HUMAN YEARS

As practicing veterinarians, all of us have had to field the age-old question: "Doc, how old is my dog in people years?" Well, thanks to medical researchers and statisticians at Purdue University in collaboration with the Mayo Clinic, we now know how to accurately respond!

Dog's physiologic age (human years) =

  {[(-0.0013 * X) + 0.0221] * C3} +

  {[(-0.0285 * X) - 0.1070] * C2} +

  {[( 0.2911 * X) + 4.9979] * C}  +

    (-3.6437 * X) + 37.4

... where X is the breed (or body size) specific median age at death (years) and C is the chronologic age of dogs in years.

Journal of the National Cancer Institute, Vol. 88, No. 22, Nov. 1996