Or you could go to a pet store and get a cat door that only opens for your cats. Also available online at http://www.moorepet-petdoors.com/
Or you can shut the window.
Nov 15, 2008 Rating
Catitude by: Anonymous
Erica- You may have to make sure your cats have gone outside before you go to bed. Then, right before bedtime, make sure all your cats are in, make sure no strange cats are in, and close the windows. You can open them again in the morning. Your kitties may not like it at first, but they'll get used to it. Putting up with their attitude (or catitude as my family calls it) for a few days is far better than the cat pee smell.