Larry the cat now holds the record for Prime Ministers a single Chief Mouser to the Treasury has tolerated.
6 PMs: Larry (2011-present)
5 PMs: Peter III (1947-1964) and Peter (1929-1946)
4 PMs: Wilberforce (1973-1987)
3 PMs: Humphrey (1989-1997) and Peta (1964-1976)