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A friend of Barack Obama’s daughter needed treatment from the White House doctor after reportedly being attacked by the First Family’s dog.

The unnamed 18-year-old — a friend of Malia Obama, the president’s eldest daughter — was bitten in the face at the White House on Monday as she bent over to stroke the Obamas’ four-year-old Portuguese water dog Sunny, according to TMZ.

The teenager shared a photograph of herself with a half-inch gash under her eye and Malia, 18, in the background on social media with the caption “I f*****g hate Sunny”.

The 18-year-old was checked out by the Obamas’ personal physician, Dr Ronny Jackson, who told her she would require stitches and it could leave a scar, according to the TMZ report.

The Obamas, who will leave the White House next week, have two Portuguese water dogs. They are not an aggressive breed, but tend to become excitable and jump up to greet people.

Sunny knocked over a two-year-old girl at a Christmas party for military families at the White House three years ago. The Obamas’ other pet, Bo, known as the “First Dog”, has not been involved in any incidents.

The President and the First Lady have recently revealed how Sunny has been a more troublesome pet than Bo.

Mr Obama told People magazine: “There have been times when she just decided the area near the Lincoln Bedroom and my office is included in being outside when it comes to pooping, which is not true.”

The White House has not commented on the incident.