Q: Our cat Andy is spraying the back door and by one of the living room windows - he was neutered when he was four months old and is an indoor only cat.  Why is he doing this and how can we make him stop!?
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A: Spraying is a difficult problem. Most cats spray in particular places (ie, on doorframes, around windows, on the garbage can).  If this is the case, you can put the cat's scent on those areas so that he doesn't feel the need to do so by spraying.  Rub a cotton cloth under his neck from ear to ear, then rub it on the surface he sprays on, after you have cleaned it with an enzyme (pet odor removing) cleaner and let it dry.  Most cats have enough hormones on them for this to work, or you can try an artificial hormone spray like Feliaway 

More info on Feliaway can be found at http://www.sunherald.com/living/docs/petdoc1120.htm

and

http://www.peteducation.com/behavior/urinespray.htm suggests restricting the view of the outdoors. If your cat sees another cat, his natural response will be to mark his territory - your home. Move furniture away from windows, pull the drapes, or cover the lower portion of your window so he can't see out.

That should help!

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