Joe and Jill Biden
Joe and Jill BidenReuters

Major, the dog of US President Joe Biden and First Lady Jill Biden, has been involved in a second biting incident in recent weeks that required medical attention, two people with knowledge of the incident told CNN on Tuesday.

The incident, which involved a National Park Service employee, took place on the White House South Lawn on Monday afternoon.

The employee was working at the time and needed to stop in order to receive treatment from the White House medical unit, according to CNN.

First Lady Jill Biden's press secretary Michael LaRosa told CNN that Major is "still adjusting to his new surroundings."

"Yes, Major nipped someone on a walk. Out of an abundance of caution, the individual was seen by WHMU and then returned to work without injury."

Major, a three-year-old German shepherd adopted by the Bidens in 2018, received training within the last two weeks, according to the White House, following a separate biting incident earlier this month.

In the first incident on March 8, Major caused an injury to a Secret Service employee at the White House, doing enough damage that the person needed treatment from the White House medical team.

At the time, White House press secretary Jen Psaki referred to the injury as "minor," and chalked up Major's behavior to "getting acclimated and accustomed to their surroundings and new people."

Major, and the Bidens' older German shepherd, Champ, were almost immediately sent to the Biden home in Wilmington, Delaware, following the incident, and were later returned to the White House.

President Joe Biden said in an interview with ABC News earlier this month that Major was receiving training.

"You turn a corner, and there's two people you don't know at all. And (Major) moves to protect," said Biden. "But he's a sweet dog. Eighty-five percent of the people there love him. He just -- all he does is lick them and wag his tail. But ... I realize some people, understandably, are afraid of dogs to begin with."