The calla lily is a beautiful, colorful perennial that looks great in vases and gardens alike. Unfortunately, it's also toxic to cats and dogs.

Calla lily poisoning occurs when your cat ingests any portion of the calla lily plant, causing severe irritation and pain to the mouth, tongue, throat, and skin. While the symptoms aren't usually life-threatening, you should seek immediate veterinary help if your cat ingests any calla lily.

However, it's worth pointing out that calla lilies aren't as dangerous for cats as true lilies and day lilies, which can cause kidney failure and death when ingested.

Symptoms of calla lily poisoning in your cat typically occur immediately after ingestion and can be incredibly painful. Signs your cat may be suffering from calla lily poisoning include:

Calla lily poisoning is a common problem due to the fact that these flowers are attractive and popular in cut arrangements and are grown in many household gardens. They can be identified by their long, trumpet-like flowers that appear on top of green stems with leaves that are broad and palm-like in appearance. Flowers can come in a variety of colors, but the most classic and common variety is white with a yellow stamen in the center.

Calla lilies contain toxic compounds known as insoluble calcium oxalates. These crystals are released when your cat bites into any portion of the calla lily plant. The compounds penetrate the soft tissues of your cat’s mouth, throat and GI tract, causing intense pain and irritation.

While all parts of the plant are toxic, the highest concentrations of the crystals occurs in the bulb or rootstock area. However, because of the severe irritation caused, most cats will not ingest large quantities of the plant. Other plants that contain insoluble calcium oxalates include the peace lily, philodendron, and umbrella tree.

Calla lilies are not true lilies (from the genus Lilium) or day lilies (from the genus Hemerocallis), so they're not in the same family as stargazer, fire, or many other types of lilies. With this in mind, calla lily poisoning should be distinguished from lily poisoning. Unlike lily poisoning, calla lily poisoning does not cause kidney failure and, while incredibly uncomfortable for your cat, does not typically result in death.

Diagnosis of calla lily poisoning in your cat begins with a thorough physical exam. Your vet will closely examine your cat’s mouth for signs of irritation. Depending on your cat’s level of discomfort, they may need to be given a mild sedative in order to allow the vet to perform the exam.

In cases of a severe reaction, your vet may wish to view the tissues of your cat’s throat. This will be done by placing a small, specialized camera into your cat’s mouth and down their throat. These pictures will help determine the extent of the poisoning and how aggressive treatment should be.

For this initial vet visit, be prepared to provide a thorough medical history of your cat. If you witness your cat chewing on any household or garden plants, bring along a sample of that plant. The sample should be large enough to allow your vet to easily identify which species of plant they ingested, which will help direct the appropriate course of treatment. 

Treatment of calla lily poisoning in your cat will address both the symptoms and the underlying cause.

Your vet will first address any life-threatening symptoms. In rare cases, irritation from calla lily poisoning can be so severe that it causes the tissues of the cat's mouth and airways to swell, making drinking, eating, and breathing difficult. If this is the case, your vet will administer anti-inflammatory drugs to your cat to help ease the swelling. Drugs that open up the airway passages may also be given. Finally, your vet may give injections of pain medication to help make your cat comfortable.

Since cats rarely ingest large quantities of calla lily plant, it's generally not necessary to induce vomiting for this type of plant poisoning. Your vet will most likely perform oral, throat and, in some cases, stomach lavage of your cat in an attempt to rinse away any remaining crystals. This will be done repeatedly to attempt to ease your cat’s reaction.

IV fluids may also be given to help prevent dehydration until your cat is able to take fluids orally.

With proper care and veterinary attention, the prognosis is excellent for a full recovery from calla lily poisoning. Symptoms may persist for several days and your cat should be kept in a calm, quiet space to allow their damaged tissues to heal.

To prevent any future poisoning incidents, either eliminate calla lilies from your home and yard, or take steps to ensure that your cat can't come into contact with calla lilies (or any other toxic plants) in the future.