I have harnesses for my boys and have let them out a time or two but Toby just wants to run under cars or around table legs. Havoc is more relaxed when he is outside, but they both yowl incessantly at the door when I bring them back inside. I don't mind taking them outside with me, but I'm afraid they're gonna dart out when I'm just going in and out myself, because they're always lurking around the door.