From a Michael Schaffer Capital City column on politico.com headlined “Joe Biden Has a Dog Problem”:

Last winter, over the New Year’s holiday, a Secret Service agent patrolling Joe Biden’s Delaware home went to check out a report of a sound going off on an alarm keypad. The agent didn’t find an intruder, but did find one of the first family’s guests, who cracked open a glass door to discuss the situation.

That’s when Commander, the Biden family German Shepherd, entered the picture.