Cameron's office says Larry, a four-year-old tabby cat, will make Downing Street his new home on Tuesday. He will be tasked with warding off a mischief of rats seen scuttling around the British leader's official residence.
Larry, a former stray adopted from London's Battersea Dogs and Cats Home, will be the latest pet to be appointed Chief Mouser to the Cabinet Office, an unofficial government pest control post.
His arrival follows several sightings of rats around Downing Street. The vermin are a common problem in London, where trash scattered on sidewalks provides a constant supply of food.