Sir David Attenborough observes Hacker T Dog in secret filming

Hacker T. Dog has been observed by legendary nature documentary maker Sir David Attenborough.

The man who has travelled across the world has witnessed the birth of new species, uncovered dinosaur eggs and pretty much seen it all

But he was stumped when shown secret footage of Hacker T dog in his natural environment.

He said he's never seen anything like it in his life.

Watch his reaction to CBBC's loveable pooch.