They make doggy doors that come with collars and only the pets with the collars can go out the door. It is to keep strange animals out of the house basically but would work with this too. The cat could not use the door and the dogs could. Good luck and let us know.
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Tessa 
Foudini, Charlee, Spottie, ShyRaven, Buddy, Tuxie, Widdle Attila Sipowitz, Lizzie, Minnie, ET, Mylo,Salem, Wicca, Marmalade, Amelia, Rocket and Turbo (we iz NOT fosters) and the 5 porch kits, Mocha, Tigger, Cali, Torti and Smudge also Riley da goggie and Buddha da baby hamster too
Onyx,Tabitha and Samantha..always in our hearts & together again//Fly free Penny 12/12/07
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ttpurr4cat
Oct 11, 2009 10:59 AM
