Downing Street’s Larry the Cat has a new roommate.

The tabby who has been dubbed the “Chief Mouser to the Cabinet Office” will have to make room at 10 Downing Street for new UK Prime Minister Boris Johnson’s new adopted puppy, the Guardian reported.

Dilyn, a Jack Russell mix, was spotted arriving Monday morning at the prime minister’s residence, which Larry has called home for the last eight years.

Johnson and his girlfriend, Carrie Symonds, rescued the 15-week-old puppy from the Friends of Animals Wales shelter after the animal was abandoned by a farmer.

Larry — who has outlasted two other prime ministers — appeared less than thrilled with his new companion.

“Confirmation that Downing Street is going to the dogs…,” the 12-year-old feline wrote on his unofficial Twitter account.

The shakeup at No. 10 comes amid a tumultuous week in Parliament as Johnson faces a Brexit showdown.