Some natural brands of cat/dog food contain a known toxic plant

[encouraging loves animals]

Yucca: vomiting, depression, diarrhea, drooling, seizures
Avacodo, Fruit, leaves and tree
Garlic in large doses

List of some plants toxic to dogs
http://www.acreaturecomfort.com/toxic.htm

List of some plants toxic to cats
http://www.cathelp-online.com/emergency/poisonplants.php

I am researching to see what brands contain this&possible other toxic ingredients.