Dog age calculator

It's a common misconception that dogs age seven years for every one human year they're alive. There's actually an enormous amount of variability between breeds, and dogs age much faster during puppyhood than adulthood.

In fact, for the first two years of their lives, Jack Russell puppies age 12.5 'dog years' for every one human year. Bigger dogs, such as the Boxer, actually age slower during the same period.

However, this completely turns around during adulthood, as smaller dogs tend to age at a slower rate than bigger dogs after the age of three human years. Jack Russells can therefore live up to 16 human years and more, whereas Bulldogs are known to sadly last for only nine.

Dog's age in human years:

The dog's breed:

Get my 3 part toolkit for Jack Russell Terriers

Email: (I send nothing but useful training tips.)

comments powered by Disqus

Get Your Free
Jack Russell Advice
Starter Pack

A 7 day dive into Jack Russell behaviour:

  • Our free Jack Russell Toolkit ebook
  • Subscriber-only access to our 4-lesson Jack Russell Workshop
  • Our private Facebook group for Jack Russell Advice

Check out all the bonuses and join 3,000+ people like you


Welcome to the Jack Russell Terrier Advice Centre! We have everything you need to make your life easier as you begin raising your new companion.