The FDA has issued a warning that Easter lilies are toxic to cats. According to veterinarian Dr. Melanie McLean at the US Food and Drug Administration ingestion of even a small portion of the leaves, pollen or flowers of the plant are very poisonous to cats. Initial complications include vomiting but then may lead to kidney failure and death if not treated. If you think your cat may have ingested a lily, then seek immediate medical attention for your pet.
Tiger, Asiatic, Day and Japanese Show lilies are also highly toxic to cats.
Dog owners take comfort, lilies are not a major threat to dogs other than some risk for developing an upset stomach.