obama running dogPresident Barack Obama and his dog Bo were very close.Getty

Dogs have been the most popular pet for a president to have during his time in the White House — 30 of the 44 presidents have had at least one dog in the West Wing.

The first to have had a dog during his presidency was George Washington, while Barack Obama most recently had two dogs during his presidency.

So far, President Donald Trump has yet to have a pet since entering the White House. The last president to not have a dog in the White House was William McKinley over 100 years ago.

Here are 25 photos of some of the most adorable and well-known canines to grace the Oval Office.