Sven has a cat named Muldar who is a genius. He wants what he wants and no human shenanigans are going to stop him. Closing the door? Pfft! Muldar will just open it. Set a pan of water in front of the door? Not a problem. For Muldar. For Sven, it's a problem.
Sven noted that the water pan was added to keep Muldar from scratching at the door, and that putting a round knob on the door (as has been recently suggested) would make no difference. I concur; Muldar would just figure out how to open a door with a round knob. -via reddit
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Install with the lock button on the outside instead of the inside. My brother had to do that with several of the doors in his house.
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