Zoe and Smokey spend a lot of time together. Activities that they enjoy include: washing each other, staring each other down, wrestling, biting, fighting over a toy mouse, chasing one another, and talking. Zoe has shown herself to be the boss in this picture, even though Smokey is the bigger cat. He doesn't quite trust her, though, hence, the ears that have gone way back.
Frequently, a potential squabble between these two friends ends when one of them becomes distracted. They can be distracted by a sunbeam.
Zoe still enjoys chasing and biting her own tail.