i have a spider plant, chia pet plant, and poinsettias. are any of these poison?

I know poinsetta's are. Here's a good list:
http://www.hsus.org/pets/pet_care/protect_your_pet_from_common_household_dangers/common_poisonous_plants.html

The biggest ones are poinsettias and lilies. I've known people who have lost cats to both of them.

Poinsettas....
pretty much every thing that would be harmful to you to eat.
Make sure they never eat chocolate. Also, if they eat enough dog food it will make them go blind! don't feed them dog food.

The ASPCA has a site with poisonous plants and it will show what part of the plant is poisonous.

http://www.aspca.org/site/PageServer?pagename=pro_apcc_toxicplants

It is in Alphabetical order.