Commander, the two-year-old German Shepherd of the Biden family, has reportedly bitten another Secret Service agent, marking the 11th incident of its kind at the White House or the Biden family residence.

The most recent attack occurred on Monday night, and the injured officer received treatment at the scene, according to a statement from the Secret Service.

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White House Press Secretary previously attributed these attacks to the stress of living in the White House.

Efforts have been made to address Commander’s behavior, including new leashing and training techniques introduced in July.