How many Jack Russell terriers are there left in the world?

It's impossible to know the exact number of Jack Russell Terriers in the world.

Here's why:

* No Global Registry: There's no central organization that tracks every Jack Russell Terrier born and alive.

* Varying Definitions: There are different types of Jack Russell Terriers (smooth, broken, rough coat) and varying breed standards.

* Popularity Fluctuates: The popularity of the breed changes over time in different regions.

While we can't give a specific number, the Jack Russell Terrier is a popular breed found worldwide, meaning there are likely many millions of them.