When Hank and Lainey interact it usually begins with sweet licks on each other's faces. Usually Lainey will clean Hank's face, demonstrating nice big sister behavior. But that quickly devolves into neck biting and kicking, and a full blown wrestle session ensues. I think they enjoy it because neither dashes off, and one is always instigating the other. I thought I would share one such fight. I guess its a good thing they don't have front claws.