Okay, nothing against cats, but I have just never been a "cat" guy. We just brought home two kittens, brother and sister. They are six weeks old. They will not be in the house, their purpose is to knock down the mouse population around the corrals and shop. I have them locked up in the shop right now, with water, food, litterbox, bedding. Of course, I do know I will have to get them nuetered as well, and will be putting in a pet door on the shop. My question; Should I leave them in there for a while so they get used to it and dont run off (thats kinda the plan unless told differently)? If so, how long?