If you sprinkle some into the bottom of your catbox it will help absorb the odor without adding anything else to it. I scent mine to use as a carpet sprinkle and similar purposes by layering it with dried lavender buds and letting it sit a few weeks. You can leave the buds in there- your cat won't mind as long as you change the box frequently so the buds don't have a chance to get soggy - or you can sift them out. It's also good for de-stinking shoes, garbage cans and pet beds. You can use any scented dried herb for this.
Source(s):
My life...
But there's more uses for baking soda listed at http://www.thefarm.org/charities/i4at/lib2/60soda.htm

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If I'm not mistaken, Arm and Hammer has a product specifically for pet smells that should work fine.
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