My two cats Tibby and Corkscrew get along great, they fight sometimes but I know they are just playing. But when you add my roommates cat into the picture it's a totally different story, Corkscrew has scratched her nose and eye and bit her ear enough to leave bad scars. They really hate each other, when we are at home they are a little more behaved because they don't want to get sprayed with the water bottle. But sometimes when we get home we'll see the cuts on Sasha from where Corkscrew bit her.