How do dog years really compare to human years?
If you still use the old “human years times seven” equation to calculate your dog’s age, you’re barking up the wrong tree. That’s not the best way to gauge your pet’s age.
During Rover’s first two years of life, the ratio is actually higher. After all, a one-year old pup can give birth. Not so, a human seven-year-old. Unless your dog is a giant breed, the ratio is smaller after that, four to five years depending on size. In general, the smaller the breed, the longer the lifespan.
There’s no exact formula for comparing dog to human years. But whatever your pet’s age, a good diet, regular medical care, and a healthy dose of affection will make your pooch a happy hound - and may add years to his life.
– Dr. Larry McDaniel, DVM for the “Purina® Animal Instincts” Podcast Series