Peace lilies are poisonous to both humans and pets. Toxicity: Toxic to Dogs, Toxic to Cats. Toxic Principles: Insoluble calcium oxalates. Please forward this to all your friends that own cats. A cat will feel the effects of munching on a peace lily almost immediately. If you know the answer to this question, please register to join our limited beta program and start the conversation right now! Lilies in general are poisonous or at least severely irritating to both dogs and cats. Some people may chose to keep the plant outdoors on the patio in the summer months. Signs of poisoning can be immediate and include drooling and vomiting. Though this can be remedied by putting the toxic plants up out of reach, it is better to find plants that are safe to keep in the home to help ensure the safety of your feline friends. Peace lilies are poisonous to both humans and pets. Unlike the more poisonous true lilies -- Asiatic, tiger and Easter lilies, to name a few -- peace and calla lilies do not cause acute kidney failure in cats. Cats are the only animals in which the Easter and stargazer lilies are known to be toxic. Cats appear to be the only species known to develop renal failure from lilies. Lilies are becoming especially popular as a gift in Australia, and the flowers that are sold are exceedingly toxic to cats. Are Peace Lilies Poisonous? Both of the true lily plants, Lilium sp. In some cases, it can even be deadly. Who knows what plants and flowers are poisonous to cats and dogs? As Easter approaches, there are Easter lilies abounding everywhere. Causes of Mauna Loa Peace Lily Poisoning in Cats Peace lilies are often used as indoor plants as they are easy to keep and unique to look at. Peace lilies are not true lilies but in the Araceae family. Symptoms are recorded as burning mouth, excessive salivation, diarrhea, dehydration, lack of appetite, and vomiting. According to the ASPCA Poison Control Center, peace lilies (Spathiphyllum) can cause oral irritation, intense burning irritation of the mouth, lips and tongue, excessive drooling, vomiting and difficulty swallowing.The toxic substance in a peace lily is the calcium oxalate crystals. Even small ingestions can result in severe kidney failure. Common Plants and Flowers That Are Poisonous to Cats . Emily, I had a similar question a while back and the answer is yes and no. Save a kitty. Although many varieties of lilies are dangerous only to cats, the beautiful peace lily is poisonous to both cats and dogs. Calla, Peace and Peruvian lilies are not ‘true’ lilies, and while they may irritate the mouth if eaten, and cause pain, salivation and facial swelling, they do not cause the serious kidney signs associated with true lily poisoning.