Greenwich police have been training their new "attack dogs" but they are a bit smaller than you might expect.

The Twitter feed for Greenwich police posted: "#ProjectServator officers training the Mets new attack dogs at @TheO2 this afternoon."

They are clearly very small dogs, but we should never judge a book by its cover.

We imagine the Met's newest canine recruits are ferocious, as well as tiny and cute in their hi-vis police jackets.

The moral of the story is not to mess with tiny things.