Many plants of the lily family are toxic to cats, and some are toxic to dogs. Cats are the only animals in which the Easter and stargazer lilies are known to be toxic. Generally, a cat’s first reaction to this plant includes vomiting, lethargy and lack of appetite, but kidney failure and even death can quickly follow if a cat is untreated. The peace lily (also known as Mauna Loa) is toxic to both dogs and cats. Ingestion of the peace lily or calla lily can cause irritation of the tongue and lips, increased salivation, difficulty swallowing and vomiting.