How do you guys keep your indoor kitties inside?? I'm terrified Cupid is going to get out. When doors open inside, he darts to them. He's been pretty uninterested in the outside doors so far, but last night he got a little closer. What can I do to keep him from getting out? I'm so worried b/c he's a little bullet and if he did get out I don't know what he'd do... If he'd run off or stay there or what. If a door opened when he's bouncing off the walls, he'd definitely dart out it. I don't know what to do. It's the thing my roommate & I are worried about most. I thought about getting one of those doors that opens in halves (do they even make those or is that just on TV? hehe), but he'd eventually get big enough to jump over the bottom.