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Peace Lily Is Poisonous To Pets

Plant Name: 
Peace Lily
Scientific Name: 
Calcium Oxalate Crystals, possibly Proteinase depending upon species
Poisoning Symptoms: 

Intense burning sensation of the mouth, throat, lips and tongue; excessive drooling, choking and swelling of the throat, inability or difficulty swallowing (dysphagia); symptoms may continue to occur up to two weeks after ingestion. Ingestion of larger quantities can result in severe digestive upset; extreme difficulty breathing, rapid shallow gasps (dyspnea). If massive amounts are consumed the symptoms become much more severe and can include any or all of the above with the addition of convulsions, renal failure, coma and death. It is possible to recover from severe calcium oxalate poisoning, however, in most cases permanent liver, and kidney damage may have already occurred.

Additional Information: 

One of the more common toxins, insoluble calcium oxalate crystals can be found in many popular houseplants and ornamentals. The vast majority of these plants belong to the Araceae family and all cause a similar clinical syndrome. Within the Aracae, genera such as Alocasia, Arisaema, Caladium, Colocasia, Dieffenbachia and Philodendron contain calcium oxalate crystals in the form of raphides. The Araceae family is one of the most diverse in the plant kingdom, comprising over 3700 different species. When consumed, these plants cause an intense burning sensation of the mouth, throat, lips and tongue; excessive drooling, choking, gagging and potentially serious swelling of the throat that could cause difficulty or the inability to swallow (dysphagia). Symptoms can occur immediately or up to 2 hours after ingestion and may continue to occur for up to two weeks after ingestion.

All parts of these plants should be considered toxic, although the leaves of some species may contain little or no toxin. These plants contain special cells called idioblasts. Found in a number of plant species both poisonous and non-poisonous, idioblasts differ from neighboring cells in that they contain non-living substances like oil, latex, gum, resin, tannin, pigments or minerals. One of these substances is raphides or bundles of needlelike crystals of calcium oxalate that tend to be blunt at one end and sharp at the other. The crystals are packed in a gelatinous substance that contains free oxalic acid.

When animals chew on the leaves, flowers or stems of the plant, the tip of the idioblast is broken allowing saliva from the animal or sap from the plant to enter the cell. This in turn causes the gelatinous material to swell forcing the raphides (needle like calcium oxalate crystals) to violently shoot out from the cells into the surrounding area. The calcium oxalate crystals then penetrate and embed themselves into the tissues of the mouth, tongue, throat and stomach causing (in most cases) immediate discomfort and aggravation as would be expected when millions of microscopic needles are lodged in ones throat and mouth. The idioblasts may continue to expel raphides for a considerable amount of time after ingestion allowing the crystals to also embed themselves into lining of the stomach and intestine causing additional gastrointestinal upset.

In addition to calcium oxalate crystals some species may also contain proteinase (proteolytic enzymes) that break protein down into amino acids stimulating the release of kinins and histamines; which cause inflammation, affect blood pressure and stimulate pain receptors. Although kinins and histamines are part of the body’s natural response to tissue damage and foreign bodies, the inflammatory response will only serve to exacerbate the damage and irritation caused by the embedded calcium oxalate crystals.

In the vast majority of cases clinical signs will present immediately or within two hours of ingestion. Clinical signs include obvious pain and irritation that is generally expressed by violently shaking the head, drooling excessively, pawing at the mouth, gagging, vomiting or dry heaving. The animal may also whine, bark or yelp in an unusually hoarse or weak sounding voice. Other clinical signs include depression, diarrhea, inappetance and swelling of the mouth, throat and tongue. In some cases swelling may be so severe as to restrict oxygen intake resulting in dyspnea (shortness of breath, gasping for air). The crystals irritation of the stomach also commonly results in diarrhea.

Due to the fact that the plant is both bitter in taste and acts as an immediate irritant to the mouth, large ingestions are uncommon. If, however, a pet does manage to tolerate consuming a massive amount the plant clinical signs will be notably worse. So much so, that the vomiting and diarrhea can severely dehydrate the animal, cause electrolyte imbalances and send the animal into shock. In cases involving massive ingestions; cardiac abnormalities, dilated pupils, coma and death have been reported.

First Aid: 

In most cases of calcium oxalate ingestion, treatment can be managed at home. Upon finding out that your pet may have ingested a plant containing calcium oxalate; the mouth should be rinsed and flushed thoroughly with water. The animal can then be given yogurt, milk, cheese or any other source of calcium to provide relief from the pain, by possibly precipitating some of the calcium oxalate crystals. In the vast majority of cases the pet will make a full recover within 12 to 24 hours of ingestion. In cases where the pet is experiencing more severe gastrointestinal upset, persistent vomiting, and diarrhea, they should be monitored carefully for signs of dehydration and provided fluid therapy if needed. Both as a preventative measure and in cases where there is obvious oral swelling it may be advisable to give the pet an antihistamine, such as diphenhydramine (Benadryl). This will help to reduce/prevent swelling, discomfort and avoid potential blockages of the airway related to the body’s inflammatory response. Typical dose rates are 2 to 4mg/kg by mouth or intramuscularly every 8 hours as needed.

To alleviate the gastrointestinal upset Kapectolin may be given at a dose rate of 1 to 2 ml/kg four times a day. Kapectolin provides a coating action that protects the stomach lining. Sucralfate may also be used as for gastrointestinal irritation as it reacts with the acids in the stomach to form a paste-like material capable of acting as a barrier between the stomach and its contents. Sucralfate is typically given to dogs weighing more the 60lbs: 1g every 6 to 8 hours; for dogs under 60 lbs: 0.5g every 6 to 8 hours; Cats: 0.25g every 8 to 12 hours to reduce irritation of the stomach and intestines.

If the airway becomes blocked due to swelling the pet should be kept under observation at a veterinary office until the swelling abates and the animal is breathing normally. Prevent further ingestion of the plant and consult a veterinarian.

Species Affected: 
Toxic To Dogs
Toxic To Cats
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Peace Lily Is Poisonous To Pets - Written By
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