President Barack Obama runs with his new pet dog Bo, a 6-month old male Portuguese water dog, on the South Lawn at the White House in Washington, April 14, 2009.
The Obama family welcomes a new puppy named Bo.
Pete Souza/White House
Presidential pet Bo climbs the stairs of Air Force One at Andrews Air Force Base, Maryland, for a flight to Chicago with President Barack Obama, Aug. 4, 2010.
Cliff Owen/AP Photo
Presidential dogs Sunny and Bo during the annual White House Easter Egg Roll on the South Lawn of the White House in Washington, April 21, 2014. President Barack Obama and first lady Michelle Obama hosted thousands of people during the annual celebration of Easter.
Olivier Douliery/picture-alliance/dpa/AP Images
President George W. Bush walks off Air Force One carrying the family pets, Barney, right, and Ms. Beazley, as he arrives at Andrews Air Force Base, Maryland, Aug. 13, 2006. Bush is returning to Washington after spending 11 days at his ranch in Crawford , Texas.
Jim Watson/AFP/Getty Images
President George W. Bush's pet dogs, Barney and Spot, step off Marine One under the guard of a U.S. Marine on the South Lawn of the White House, May 5, 2003.
Texas Governor and Republican presidential candidate George W. Bush and his wife Laura ride in the family pickup truck with their dog Spot, the daughter of George Bush Sr.'s dog Millie, Sept. 16, 2000, in Crawford, Texas.
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President Bill Clinton is greeted by his dog Buddy on the South Lawn of the White House, June 13,1999, in Washington. Clinton had just returned from Chicago where he spoke at a University of Chicago commencement and met with the Illinois Air National Guard.
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Press photographers surround Socks, the cat that belongs to the family of U.S. President-Elect Bill Clinton, Nov. 17, 1992, outside the governor's mansion in Little Rock.
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Pres. George Bush shares a Valentine's Day card with two of his dogs.
Susan Biddle/White House/The LIFE Picture Collection/Getty Images
President Ronald Reagan with his Bouvier des Flandres, Lucky, in 1985.
Ronald Reagan Library, via National Archives via The York Times
First Lady Nancy Reagan cradles an early Christmas present, a King Charles spaniel, as she and President Reagan stroll along the South Lawn of the White House in Washington, Dec. 6, 1985, after returning from New York. The new dog, a brother of a dog owned by National Review editor William Buckley Jr., is described as "housebroken and extremely well-mannered."
Dennis Cook/AP Photo
President Jimmy Carter and Rosalynn Carter play with their dog Grits on the South Lawn of the White House in Washington, after returning from church, Aug. 6, 1978.
Pres. Ford enjoys the company of his pet golden retriever, Liberty, in the Oval Office.
David Hume Kennerly/White House/The LIFE Picture Collection/Getty Images
President Richard M. Nixon smiles and pets his dogs Irish Setter 'King Timahoe,' Yorkshire Terrier 'Pasha' and French Poodle 'Vicky,' outside the White House, Washington, April 30, 1970.
Pictorial Parade/Getty Images
Lawyer Richard Nixon relaxing with his poodle Vickie & his cocker spaniel Checkers in his apartment.
Bob Gomel/The LIFE Images Collection/Getty Images
President Johnson playfully pulls on the ears of his pet beagles, Him and Her, while several men watch. Johnson claimed that the ear-pulling and subsequent yelping was harmless, and actually did the dogs good. The Chicago Humane Society protested and criticized the president for the ear-pulling, saying it was "far and away the wrong way" to treat animals.
Bettmann Archive/Getty Images
Caroline, first lady Jacqueline Kennedy, John Jr. and President Kennedy vacation in this undated photo.
President Kennedy and Mrs. Kennedy with their children, Caroline and John Jr., at Camp David in Maryland, March 31, 1963. Caroline is seated on "Macaroni." The saddle on Macaroni was a gift from King Hassan II of Morocco.
Robert Knudsen/White House Photographs/JFK Presidential Library and Museum
Oblivious to its palatial and imposing surroundings, Feller, a 5 week-old cocker spaniel gifted to President Truman, sits disconsolately outside its shipping case in a large corridor of the White House in Washington on Dec. 22, 1947.
Bill Smith/AP Photo
President Franklin D. Roosevelt in his car with his Scottish terrier, Fala, Feb. 7, 1941.
Hulton Archive/Getty Images
Franklin D. Roosevelt with Fala, his dog, and Ruthie Bie in Hyde Park, New York, 1941.
Universal History Archive/UIG via Getty Images
President Franklin D. Roosevelt sits behind the wheel of his car outside of his home in Hyde Park, New York, mid 1930s.
President Herbert Hoover and his dog Various, Washington, 1931.
Calvin Coolidge is seen with a pet dog in 1925.
Library of Congress/Getty Images
President Warren G. Harding plays with his dog as a photographer takes a picture of them.
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Warren Gamaliel Harding
Library Of Congress/Getty Images