How Old is My Pet? Correctly Calculate Your Dog or Cat's Age!By Webvet | 
Pets – Fri, Mar 2, 2012 11:22 AM EST


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By Gayle Hickman 

Most people think that calculating the age of dogs and cats in "human years" is 
quite simple: multiply their age by seven. For 
example, a 4-year-old dog or cat would actually be 28 years old in human years. 

But when you really begin weighing out the arithmetic, this method 
doesn't add up. Say a 1-year-old dog is the equivalent of a 7-year-old 
human -- get out of here! How many 7-year-old humans are sexually active
 and capable of reproducing? Dogs and cats are much more likely to have 
babies at 1 year old or even at 10 years old, than any person who is 7 
or 70. 


Aging is much faster during a dog's first two years but varies among 
breeds. Large breeds, while they mature quicker, tend to live shorter 
lives. By the time they reach 5 they are considered "senior" dogs. 
Medium-sized breeds take around seven years to reach the senior stage, 
while small and toy breeds do not become seniors until around 10. 

Related: Top 5 Ways to Improve Life for Your Senior Dog 

Many veterinarians agree that a pretty good guess on the age of pets can
 be made using the following formula. Although still simple, it is much 
more accurate than the seven-year method. 

Assume that a 1-year-old dog is equal to a 12-year-old human and a 
2-year-old dog is equal to a 24-year old human. Then add four years for 
every year after that. (Example: A 4-year-old dog would be 32 in human 

Since this method takes into consideration the maturity rate at the 
beginning of a dog's life and also the slowing of the aging process in 
his later years, Martha Smith, director of veterinary services at 
Boston's Animal Rescue League, feels that this is the more accurate 
calculation formula. Here is a chart, for easy reference: 

  A dog's average lifespan is around 12 or 13 years, but again, this 
varies widely by breed. The larger your dog is, the less time it will 
live. Female dogs tend to live a little longer. 


Now let's take a glimpse at a simple formula for calculating feline age in 
human years. 

Assume that a 1-year-old cat is equal to a 15-year-old human and a 
2-year-old cat is equal to a 24-year-old human. Then add four years for 
every year after that. (Example: A 4-year-old cat would be 32 in human 

The following chart shows this formula of calculation: 


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