Biden has said that Major received training while at his home in DE before returning to the White House grounds last week.
"Major is still adjusting to his new surroundings and he nipped someone while on a walk", the spokesperson explained.
"Yes, Major nipped someone on a walk", LaRosa told the outlet, adding that "out of an abundance of caution, the individual was seen by [a White House medical unit], and then returned to work without injury."
Major might be back in the doghouse again after another White House biting incident.
CNN reported that the incident occurred on the South Lawn of the White House, noting that the victim "was working at the time and needed to stop in order to receive treatment from the White House medical unit". Champ, the older of the two, joined the Bidens in late 2008.
The incident, which involved a National Park Service employee, took place on the White House South Lawn on Monday afternoon.
Earlier this month, Major bit a security staff member, according to reports. The Bidens adopted Major from the Delaware Humane Society in 2018. He was sent away to Biden's DE home after the incident.
"You turn a corner, and there's two people you don't know at all, and he moves to protect", Biden said.
He said the dogs went to Wilmington because the first couple was going to be out of town.
Biden previously downplayed the dog's behavior, saying he was protecting him from the Secret Service.
Likely not laughing: Major Biden, who could be heard exclaiming "Rhait, rhut?" when a New York Post reporter first brought up the subject a few weeks ago, and who is probably trying desperately to cross himself with elbows that don't bend like that as we speak. I was going to be away for two, so we took him home, ' Biden said at the time. "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".
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