When you look at the current research on spaying and neutering, the AGE at which it's done turns out to be vitally important to your dog's future health. For example, your female dog should NOT be spayed at 6 months old.
Life Expectancy of Dogs and Cats. We hope our pets will be a part of our lives for many, many years but the fact is that the average life expectancy is 10-12 years for dogs and 10-14 years for cats. Older pets have very specific needs and are particularly susceptible in later years to cancer, arthritis, and dental disease.
However, some cats may attain the age of 21 years or more. By comparison, the average life expectancy of humans in the United States of a newborn baby in 2014 was 79.56 years. The oldest cat ever recorded was Creme Puff, who died in 2005, aged 38 years, 3 days.