Use a double door system, a camera, and a computer to control it. Like this guy did. He was tired of the kitty bringing home "presents"
http://www.g4tv.com/techtvvault/features/37142/High_Tech_Cat_Door.html
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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