Actually, both.
Bitsy chases Kiki then Kiki chases Bitsy, back and forth.... lol.
Kiki also "attacks" us when we walk past a door opening, past the bed, past a chair, past the corner of a cabinet, enter the door, yada yada yada.... ...stands up on her hind feet with those front paws up in the air like a bear...lmbo.
Kiki also chases the rope dog toy that Bitsy can't stand. It's Kiki's favorite toy.... lmbo.