I wrote about the things that are toxic to cats in my book . Here the first paragraph of that chapter..
Many substances are especially toxic to cats because the liver has a low capacity to metabolize them. To repeat what Dr. Patrick Reeves stated, “Cats have a very low tolerance to toxins. If you give a Tylenol to a cat they are dead in 30 minutes. Not so for a dog.” As John K. Dunn states in his Textbook of Small Animal Medicine, “toxic side effects develop more easily in cats in cases of overdoses of toxins from plastic and other toxins, or reduced liver function.”