Four-legged friends are a time-honored White House tradition. President Taft had a cow. FDR had his terrier Fala. The Kennedys gave young Caroline a pony she named Macaroni. Lyndon Johnson had dogs named His and Her. Nixon had Checkers, the Fords had Liberty, the Clintons had Buddy the lab and Socks the cat, and the Bushes had Barney and Miss Beazley. Now the Obamas have Bo.
Here's a look back at at the most recent presidential pets: