Well, most of the time it just isn't a problem. Plus, cats aren't boundary oriented. Our current batch of cats get super worried when a door separates them from us. They once crashed in the bathroom door to save Michelle from the bath. They're just that loyal. The boundary I enforce is the door to the outside. I try to observe when my indoors/outdoors cats come and go and intercept them with whatever wiggling thing they have in their mouths. Really, though, I don't have many behavioral problems with my cats.
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