1. Lyndon B. Johnson sings with his grandson and his dog Yuki:
2. Lyndon B. Johnson, his grandson, and Yuki swim in the White House swimming pool:
3. Richard Nixon's dogs King Timahoe, Vicky, and Pasha look out of a White House window:
4. Bill Clinton takes his cat Socks for a walk:
5. Gerald Ford takes his dog Liberty for a walk with his wife at Camp David:
6. George W. Bush's dog Barney begs for a belly rub on the White House lawn:
7. Ronald Reagan's dog Lucky sits in his lap on Marine One:
8. Ronald Reagan goes for a run with Lucky and Margaret Thatcher:
9. Socks has some fun at the White House during Easter:
10. Amy Carter holds her cat Misty Malarky Ying Yang in the White House:
11. Nancy and Ronald Reagan get ready for their excited dog Rex to greet them as they disembark Marine One:
12. Amy Carter and Misty Malarky Ying Yang pose for a photo:
13. Gerald Ford's daughter takes a quick moment to pose with their family's cat at the White House:
14. Amy Carter pets her dog New Grits on the White House steps:
15. Gerald Ford's dog Liberty and her puppies at the White House:
16. Liberty poses in front of the White House:
17. Buddy gives Bill Clinton a tennis ball while he golfs:
18. Socks hangs out in the Oval Office:
19. The Kennedy family dogs pose for a picture while just hanging out:
20. Harry Truman's dog Feller looking... sad.
21. Buddy goes for a swim in the White House fountain:
22. George W. Bush's cat India looks around a corner:
23. Socks licks a White House gingerbread house:
24. First Lady Michelle Obama pets Bo before a taping of The Ellen DeGeneres Show:
25. Buddy attempts to retrieve a tennis ball from a White House swimming pool:
26. George W. Bush looks at his dog Barney while on his ranch:
27. Barney pushes a golf ball in the Oval Office:
28. President Obama's dog Bo sits outside a car:
29. Barney greets a little boy:
30. George H.W. Bush pets his dog Millie and her puppies:
31. First Lady Barbara Bush wears matching sweatsuits with her dogs Ranger and Millie in the White House:
32. Millie sits next to a "Beware of Dog!" sign on the White House lawn:
33. Barbara Bush pets Millie and her puppies on the White House lawn:
34. Lyndon B. Johnson presents a basket of puppies to the daughter of a White House staffer:
35. Yuki and Lyndon B. Johnson share a tender moment in the Oval Office:
36. Bo gets some birthday treats:
37. Lyndon B. Johnson and Yuki pose for a photo on a fence:
38. Kennedy family dog Pushinka and her puppies sit with their kennel keeper:
39. Richard Nixon's dogs pose for a Christmas photo:
40. George Bush and Barney share a moment on the White House lawn:
41. Richard Nixon presenting Pasha to David Lupi, the poster child of the National Hearing and Speech Foundation:
42. Bo looks into a window of the Oval Office:
43. Bo Obama plays during a blizzard:
All photos via The National Archives unless otherwise cited.