World leaders and their pets

President John F. Kennedy

The family of President John F. Kennedy vacations in this undated photo. From left: Caroline, first lady Jacqueline Kennedy, John Jr. and President Kennedy. (AP Photo)

President Ronald Reagan - Rex (King Charles spaniel)

This December 1986 file photo shows first lady Nancy Reagan holding the Reagans' pet Rex, a King Charles spaniel, as she and President Reagan walk on the White House South lawn. (AP Photo/Dennis Cook, FILE)

President George H.W. Bush - Millie

This Aug. 24, 1992 file photo shows President Bush, right, and first lady Barbara Bush walking with their dog Millie across the South Lawn as they return to the White House. (AP Photo/Scott Applewhite, File)

President Bill Clinton - Buddy

This March 13, 1998 file photo shows President Clinton, center, and first lady Hillary Rodham Clinton with first puppy Buddy as they leave the White House for a presidential retreat at Camp David, Md. (AP Photo/J.Scott Applewhite, FILE)

President Bill Clinton - Socks

The White House's first feline, Socks, paws and claws around in the arms of first lady Hillary Rodham Clinton during an East Room event introducing her new book featuring Socks and Buddy, the president's Labrador retriever, Wednesday night, Feb. 3. 1999, at the White House. The book includes children's letters to the first pets and a short history of animals that have roamed the White House in the past. (AP Photo/J. Scott Applewhite)

President Bill Clinton - Socks

In this March 19, 1994 file photo, Socks the cat peers over the podium in the White House briefing room in Washington. Socks, the White House cat during the Clinton administration, has died. He was about 18. Socks had lived with Bill Clinton's secretary, Betty Currie, in Hollywood, Md., since the Clintons left the White House in early 2001. (AP Photo/Marcy Nighswander, File)

President George W. Bush - Barney & Spot

President Bush and first lady Laura Bush, with their dogs Barney, right, and Spot, left, talk with the media after arriving in Waco, Texas, Tuesday evening, Nov. 13, 2001. President Bush will host Russian President Vladimir Putin at his Crawford, Texas, ranch later this week. (AP Photo/Eric Gay)

President George W. Bush - Barney

President Bush does his best to salute while holding his dog Barney as they get off of Air Force One at Andrews Air Force Base, Md., Monday, June 25, 2001. Bush spent the afternoon in Detroit for the annual U.S. Conference of Mayors where he called on the mayors support for more faith-based initiatives. (AP Photo/Susan Walsh)

President George W. Bush - Barney

President George W. Bush - Barney
After arriving
in Washington from Camp David, Md., by helicopter, President Bush retrieves his black Scottish terrier, Barney, that wandered off to a nearby tree on the grounds of the Naval Observatory, Sunday, April 14, 2002. The helicopter landing site was changed because of the annual garden tour at the White House. (AP Photo/J. Scott Applewhite)

Vice President Dick Cheney - Jackson & Dave (Labrador retrievers)

In this photograph provided by the White House, Vice President Dick Cheney's Labrador retrievers Jackson, left, and Dave, right, prepare for Halloween, Tuesday, Oct. 30, 2007, as they sit for a photograph at the Vice President's Residence at the Naval Observatory in Washington. Jackson is dressed as Darth Vader, Dave is dressed as Superman. (AP Photo/The White House, David Bohrer)

President Luiz Inacio Lula da Silva

Brazilian President Luiz Inacio Lula da Silva has an early walk with his dog at his official residence in Brasilia, on Monday, Nov. 1, 2004. Silva suffered major defeats in an electoral test Sunday of his ruling party's influence, but analysts predicted Brazil's first elected leftist leader would not suffer long-term political damage. (AP Photo/Eraldo Peres)

Prime Minister Vladimir Putin - Buffy

Russian Prime Minister Vladimir Putin plays with a dog at the Novo-Ogaryovo residence outside Moscow, Thursday, Dec. 9, 2010. A five-year old boy won a competition to find a name for the dog, which Bulgarian Prime Minister Boyko Borissov gave to Putin in Sofia last month. Vladimir Putin has named his new dog Buffy. (AP Photo/RIA Novosti, Alexei Druzhinin, Pool)

Prime Minister David Cameron - Larry

Larry the new cat for 10 Downing Street, walks down the stairs of the Prime Minister David Cameron's official residence in London, Tuesday, Feb. 15, 2011. Britain's government says Prime Minister David Cameron has a new ally to help fend off his foes armed with whiskers, claws and a flash of sharp teeth. 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. (AP Photo/Mark Large, Pool)

President Barack Obama - Bo (Portuguese water dog)

President Barack Obama watches as Malia shows off their new dog Bo, a 6-month-old Portuguese water dog, on the South Lawn of the White House in Washington, on Tuesday, April 14, 2009. (AP Photo/Ron Edmonds)

President Barack Obama - Bo (Portuguese water dog

This photo provided by the White House shows President Barack Obama welcoming the family's new puppy Bo, at the White House. March 15, 2009. (AP Photo/Pete Souza, White House)