On the day Joe Biden adopted the dog from the shelter, he stayed "telling stories and taking selfies with staffers" for over an hour.

[11] Major has been known for displaying agitated behavior on multiple occasions, in the past including "jumping, barking, and charging" at staff and security.

[15][16] On March 30, Major was involved in a second biting incident at the White House, having bitten a National Park Service employee during a walk.

[18][19][20] Theodore Roosevelt's bull terrier Pete bit numerous people, even tearing the pants off of ambassador of France to the United States Jean Jules Jusserand.

[21][22][23][24][25] In July 2020, Biden's granddaughter, Naomi, posted a tweet showcasing Champ and Major fighting over a Donald Trump chew toy.

[26] Champ and Major both appeared in advertisements for Biden in his 2020 presidential campaign against President Donald Trump who had no pets in the White House.