Apparently, they have shown aggressive behaviour on more than one occasion.

The US President, Joe Biden, had to say goodbye to his dogs after a so-called “biting incident” at the White House. The incident involved White House security and CNN reports that this is not the first time the dogs showed aggressive behaviour. The two German Shepards were sent home to Biden’s estate in Delaware. The First Lady has said in an interview that she has been obsessed with getting their dogs settled in the White House – something that has proven challenging for them to do for the past few weeks. The dogs are 3 and 13 years old, respectively.