Question: Is there a pet door that will let my dog out and keep the cats in?
Maybe/Yes. The Plexidor XL almost always works. As the Plexidors get larger the springs get stronger. 95% of cats will not use the Plexidor XL. Most cats will use a Plexidor L.
Motorized electronic pet doors will not keep the cats in. The cats will wait for the dog to exit. When the door opens they will run out the door in front of the dog.
The extra large plexidor is available at:
http://www.dogdoors.com?tip=guru
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