Major, aged 3, who was adopted by Joe & Jill Biden in November 2018 from a Delaware animal shelter, was involved in what people described as a 'Biting incident' involving a member of the White Houses' staff (Probably a republican!).

The exact condition of the victim is unknown, however, the episode was serious enough that the two dogs were subsequently moved back to Wilmington, Delaware, where they remain.

Major, who is 3 years old, is the younger of the two Biden dogs, and has been known to display agitated behaviour on multiple occasions, including jumping, barking, and "Charging" at staff and security, according to sources at the White House.

The senior of Biden's two German Shepherds, Champ, is approximately 13 and has slowed down physically due to his advanced age.

Champ and Major moved into the White House in January, less than a week after Biden's inauguration.

"I've been getting obsessed with getting our dogs settled because we have an old dog and we have a very young dog," Jill Biden told Kelly Clarkson last month during an appearance on "The Kelly Clarkson Show."

"They have to take the elevator, they're not used to that, and they have to go out on the South Lawn with lots of people watching them. So that's what I've been obsessed with, getting everybody settled and calm."

Biden also said the only place the dogs are not allowed is on the furniture, though she admitted to catching Major on the couch. "They run all over," said Biden.

A person familiar with the dogs' schedule confirms to CNN they are in Delaware, but noted they have been known to stay there with minders when the first lady is out of town.

Biden departed Monday afternoon for a two-day trip to Washington and California to visit military bases.