Presidential pups: Bo and Sunny over the years (24 images)

Bo, the family pet is U.S. President Barack Obama, plays in the snow during a blizzard on the South Lawn of the White House in Washington on February 10, 2010. UPI/Pete Souza/The White House

First Lady Michelle Obama reacts after the family dog Sunny knocked over Ashtyn Gardner, 2, of Mobile, Alabama, during a holiday craft event with military children, in the State Dinning Room, at the White House in Washington,D .C. on December 4, 2013. UPI/Kevin Dietsch

President Barack Obama and his family's new dog, Bo, play on the South Lawn of the White House in Washington on April 14, 2009. Bo, a Portuguese water dog, was a gift to the Obama's from Sen. Edward Kennedy (D-MA). (UPI Photo/Kevin Dietsch)

U.S. President Barack Obama and his daughters Malia (L) and Sasha play with their dog Bo on the South Lawn of the White House in Washington on April 14, 2009. (UPI Photo/Lawrence Jackson/White House )