Never give asprin to cats! I just thought this was worth posting. Feel free to add other common household hazards foods, plants etc... to this list Aspirin Toxicity in Cats ~ Pawprints and Purrs, Inc. (http://www.sniksnak.com/cathealth/aspirin.html)

Flowers... poisonous to cats...

Chocolate... posionous to dogs.

Lilies are highly toxic to cats.

So are permethrins, used in many canine spot-on flea treatments.

Phenols are toxic, too. That's found in cleansers, like Pine-Sol and Lysol.

Mothballs are bad.

And, of course, there's always antifreeze.