> I've been looking for a magnetic or infared activated cat door, that
> operates the opposite of the standard ie. the cat wears a collar that
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> thanks
> .rick..
Haven't heard of one with a collar that has a lock only setting. Besides,
they can be pretty smart about the door. He could just follow one of the
other cats out. Mine have figured out how to unlock their cat door. I
replaced one of my basement windows with a panel containing the door and one
panel that can open with a screen. There is a catwalk suspended from the
floor joist that runs out and over to the top step of the basement stairs.

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