15 plants that are poisonous to dogs
Plants and your pup
Plants are having a real moment right now, and for good reason. They add beauty to your home, help you feel more in tune with nature, and they even boast health benefits. Unfortunately, some of the most popular and best indoor plants are toxic to dogs, who don’t know which ones are safe to munch on or play with and which absolutely aren’t.
With veterinary help, we’re calling out the most common indoor and outdoor poisonous plants for dogs so you can avoid or get rid of them and replace them with some pup-friendly options.
If you suspect that your pup has munched on a poisonous plant for dogs, consult your vet immediately.
Aloe Vera
Toxic components: saponins, anthraquinones
Because it’s so easy to maintain and boasts medicinal qualities, aloe vera is a common household plant that people keep both indoors and outdoors. Unfortunately, the gooey gel beloved for its soothing benefits also contains two components that make this plant toxic to dogs when consumed. Typically, signs of ingestion include lethargy and upset stomach, including vomiting and diarrhoea. If you bring this plant into your home, we recommend keeping it high up – like on a sink ledge – so it’s inaccessible.
Golden Pothos (epipremnum aureum)
Toxic component: insoluble calcium oxalates
The winding, ivy-like golden pothos (“Devil’s Ivy”) is another poisonous plant for dogs that contains insoluble calcium oxalates – glass-like crystals that can cause severe irritation when eaten. One of the key symptoms is oral itching and irritation, which can sometimes lead to intense burning and pain in and around your pet’s mouth. It can also lead to excessive drooling, vomiting, or difficulty swallowing.
Milk Weed
Toxic components: cardiotoxins, neurotoxins
Though it’s a wonderful beacon for some of our favourite insects – including monarch butterflies and tussock moths – milkweed is one of those plants toxic to dogs. Some species contain cardiotoxins that affect a pet’s heart, while others contain neurotoxins that can affect organ function and mental state. As such, this plant should always be kept outdoors and/or out of reach from your dog.
When consumed, it can cause severe reactions, including depression, weakness and diarrhoea, followed by more intense reactions such as seizures, breathing difficulty, organ failure and death.
Sago Palm (cycas revoluta)
Toxic component: cycasin
The sago palm is leafy, beautiful and very easy to grow, which makes it a popular choice as an indoor plant. However, this plant’s toxic to dogs, so you should definitely keep it out of your house. “If consumed by your dog, the sago palm causes severe vomiting, diarrhoea and abdominal pain, as well as stumbling, tremors, seizures and temperature-regulation issues,” warns veterinarian Christie Long. “Ultimately, it causes liver failure, and death can occur with ingestion of an amount as small as a single seed.”
Azaleas (rhododendron)
Toxic component: grayantoxin
Azaleas are colourful and interesting to look at, so it’s easy to see why your dog might be attracted to them. Unfortunately, all parts of the azalea plant are poisonous to dogs, including the flower, leaves, seeds and even honey that’s made from the nectar.
“When azaleas are consumed by your dog, it can result in hypersalivation, vomiting, diarrhoea, muscle weakness, vision problems, slow heart rate (bradycardia), heart arrhythmia and/or low blood pressure (hypotension), cardiovascular collapse, and possible death,” warns vet Shelly Zacharias.
Tulips (tulipa)
Toxic components: tulipalin A and B
Tulips are one of the most popular plants come springtime, but they can cause big problems for curious canines. The flower and stem parts of the plant are toxic, but the bulbs are especially dangerous when consumed. Clinical signs of ingestion include vomiting, diarrhoea, hypersalivation, and even depression.
Garlic and onion (allium species)
Toxic component: n-propyl disulfide
Though it’s easy to assume that all vegetables and herbs found in the garden are perfectly OK for your pup, that’s not always true. The allium species – which includes garlic and onions – are poisonous plants for dogs.
“Any plant in the allium family, if ingested in large enough quantities, can cause a severe reaction in the bloodstream called hemolysis, in which red blood cells are destroyed in large numbers,” says Dr. Long. “The results are severe weakness, rapid breathing, and red-coloured urine.”
She adds that forced vomiting by a veterinarian is key here, and many dogs will require blood transfusions to replace the blood cells that are damaged in order to survive.
Dumb cane (diffenbachia)
Toxic components: insoluble calcium oxalates, proteolytic enzyme
This stout, leafy tropical indoor low light houseplant may be pretty, but it should be kept out of reach of canines. “This plant contains calcium oxalate crystals, which are similar to microscopic pieces of glass resembling needles,” explains Dr Zacharias. “Chewing or ingesting it causes toxicity. Common symptoms are vomiting, swelling of the mouth and/or throat, severe oral pain, pawing at mouth or eyes, severe skin irritation, agitation, coughing, gagging and hypersalivation.”
Simply coming into contact with the plant can cause symptoms, as well. If your dog’s eyes and skin are exposed, flush immediately or give them a bath.
Elephant’s ear (alocasia)
Toxic component: insoluble calcium oxalates
Alocasia – also known as elephant’s ear – is a striking dark green plant commonly found indoors. Like dumb cane, it contains glass-like insoluble oxalate crystals that can cause severe irritation both internally and externally, notes the Pet Poison Hotline. If consumed, an immediate visit to your vet is recommended to monitor and treat symptoms. If your dog’s skin or eyes has become irritated by the plant, a bath and/or flushing the skin and eyes with water is recommended.
Citrus plants and peels (rutaceae family)
Toxic components: essential oils and psoralens
“Many [citrus] plants that produce edible fruit – including grapefruit, oranges and lemons – are toxic if the actual plant portion is ingested. For example, the skin of the fruit, the leaves, or stems can often be dangerous,” says Dr Zacharias.
Whether you grow these plants in your yard or bring them into your home from the grocery store, keep your dog away from them. Reactions may not be as severe as with other plants toxic to dogs, but if you suspect consumption, call your vet for guidance. They may request that you bring your dog in, especially if severe symptoms occur.
Oleander (nerium oleander)
Toxic component: cardiac glycosides
Oleander, known for its white or pink flowers and height that provides privacy between yards, is another poisonous plant for dogs.
“Oleander ingestion causes extreme salivation, abdominal pain, vomiting, diarrhoea and lethargy. In severe cases, it causes liver failure and death, and it can ultimately interfere with the heart’s ability to beat properly,” explains Dr Long. “Once it is known that the dog ingested these poisonous leaves, rapid transfer to a veterinary hospital where vomiting can be induced is key. Supportive therapy with drugs designed to control gastrointestinal signs, as well as reverse liver and heart issues, is key to survival.”
Snake plants (sansevieria trifasciata)
Toxic component: saponins
Because of its striking appearance and the fact that it’s a houseplant that’s very hard to kill, snake plants are found in houses all across the world. Unfortunately, they are also poisonous plants for dogs and can cause nausea, vomiting and diarrhoea if consumed. It’s important to contact your veterinarian right away if you think your dog has ingested any portion of a snake plant. Depending on the severity, you may need to simply monitor and treat your dog’s symptoms, or you may need to take your dog in for more aggressive treatment.
Morning glory (ipomoea)
Toxic component: indole alkaloids
This beautiful vine plant that flowers in the morning may be irresistible to humans – and also to dogs – who might be tempted to chomp on them when they open. “The seeds are most toxic, and canine consumption can cause vomiting, nausea, pupil dilation (mydriasis), hallucinations, incoordination, diarrhoea, anaemia, confusion and liver failure,” notes Dr Zacharias.
Go to your veterinarian or an emergency veterinary centre right away if you suspect consumption. Treatment consists of activated charcoal, IV-fluid administration, and ongoing symptomatic support.
Lily of the valley (convallaria majalis)
Toxic component: cardenolides
Lily of the valley is a beloved indoor and outdoor flower, but pet parents should not introduce it to their home or garden since this plant’s toxic to dogs. Known for its delicate white flowers, it is a highly poisonous plant for dogs and can result in vomiting, irregular heartbeat, reduced blood pressure, confusion and disorientation. In severe cases, it can even cause seizures or lead to a coma. Consult your veterinarian immediately for further instruction if you suspect your dog has consumed this plant.
Yew (taxus)
Toxic component: taxine
Yew is an evergreen shrub typically found outdoors. “If ingested, it can cause sudden death, trembling, muscle weakness, trouble breathing, collapse and heart arrhythmia,” says D. Zacharias. “If you suspect your canine has eaten any part of this plant, immediately go to your veterinarian or emergency veterinary centre. Treatment will consist of gastrointestinal decontamination – activated charcoal or possibly gastric lavage or an enema – as well as IV-fluid therapy and supportive therapy for any respiratory or cardiovascular function.”
Image: Getty