Joe Biden Introduces New Puppy on Twitter: 'Welcome to the White House, Commander'

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The White House just welcomed a new resident!

On Dec. 20, President Joe Biden introduced the world to a new first dog.

"Welcome to the White House, Commander," Biden, 79, tweeted along with a photo of the adorable puppy running through the grass with a tennis ball in its mouth. The president also shared a video welcoming the new pet ("hey, pal").

Commander is the third dog to move into the famous residence during Biden's presidency.

The president and First Lady Dr. Jill Biden brought along their two dogs, Champ and Major, when they moved into the White House in January. It marked the first time in four years that a pet had lived at the presidential residence and the very first time a rescue dog called 1600 Pennsylvania Avenue home. The Bidens adopted Major from the Delaware Humane Association in 2018.

Commander's arrival comes six months after the death of the Bidens' German shepherd, Champ. On June 19, Biden announced the pet's passing, calling the 13-year-old canine a "loving companion."

"Our hearts are heavy today as we let you all know that our beloved German Shepherd, Champ, passed away peacefully at home. He was our constant, cherished companion during the last 13 years and was adored by the entire Biden family," the president and first lady wrote in a joint statement at the time.

RELATED: President Joe Biden's Dogs Featured in Kid's Book: Champ and Major

The Bidens' 2-year-old dog, Major, initially left the White House earlier this yea to undergo additional training following a "biting incident" at 1600 Pennsylvania Ave.

A spokesman for the first lady told The New York Times on Monday that Major would be permanently moved to another home based on what the family believed was best for him.

"After consulting with dog trainers, animal behaviorists and veterinarians, the first family has decided to follow the experts' collective recommendation that it would be safest for Major to live in a quieter environment with family friends," the spokesman said. "This is not in reaction to any new or specific incident, but rather a decision reached after several months of deliberation as a family and discussions with experts."

The Bidens are still awaiting the arrival of a foster cat, per the Times.