Toxic Plants in Your Home – What You Need to Know

The Moj Veterinar team put together a guide that briefly explains which plants around your home can be dangerous and toxic to your pets. First, let's explain how we graded the plants by toxicity level.

Philodendron

is a toxic houseplant often found in apartments. Its foliage is only harmful on direct contact with it, and simply being in a room where a philodendron sits isn't harmful — in fact, it has several positive effects on our health.

Still, if the plant is handled, the sap it contains can irritate the skin and mouth, and may lead to breathing difficulty, throat swelling and stomach upset. Although more serious reactions are quite rare, it's best not to keep this houseplant at home if you have small children or pets.

In people, philodendron can cause mild symptoms, including swelling of the mouth or digestive tract. But this plant is far more dangerous for animals, in which it can cause pain, cramps, seizures and swelling. It appears to be more dangerous and toxic for cats.

Aloe Vera

Aloe vera is a well-known houseplant, known for its beneficial properties for people. You may not have known that it's toxic to dogs and cats because of the saponins and anthraquinones in its latex — the bitter, yellow sap between the outer rind and the inner leaf gel. This substance acts as a strong laxative, causing stomach irritation, dehydration and other problems.

In dogs, signs include vomiting, diarrhea (often bloody), fatigue, loss of appetite, lethargy, tremors, urine turning red, stomach pain, an unusual heart rate, muscle weakness, and in severe cases even seizures or a comatose state. There's no defined "safe" dose — any amount can be a problem. Long-term exposure to small amounts can lead to lasting issues such as anemia or red blood cell damage.

In cats, the signs are similar: nausea, vomiting, diarrhea (possibly bloody), loss of appetite, fatigue, paralysis in severe cases, and kidney damage. Cats can also injure themselves on the plant's spiny leaves.

Prevention means keeping the plant away from pets, using fences or barriers, and avoiding putting aloe products on an animal's skin. If your pet eats any, contact your vet right away. Treatment includes inducing vomiting (only under veterinary supervision), activated charcoal, IV fluids for hydration, and symptomatic support; most cases recover quickly with prompt care.

The risk to pets is significant, so it's best to avoid keeping aloe vera in a home with dogs and cats.

Dieffenbachia, also known as Dumb Cane

Dieffenbachia is genuinely beautiful and common in homes, but keep one thing in mind: it contains tiny calcium oxalate crystals that are released when a pet bites into a leaf or stem. Those crystals can cause an unpleasant burning sensation in the mouth, increased drooling, swelling of the tongue or throat, and in rare cases even difficulty breathing.

The good news is that most cases don't become serious if you act in time — your pet is usually fine again soon, often with veterinary help. Still, the fact is that a "small" plant doesn't mean "no risk."

If you notice your pet has bitten the plant or come into contact with it: rinse its mouth with lukewarm water and watch for signs such as excessive drooling, difficulty swallowing or vomiting. If in doubt, contact your vet right away — it's better to act sooner than later.

Oleander – Nerium oleander

Although visually beautiful, oleander is highly toxic — to both people and animals. Key facts: every part of the plant — leaves, flowers, stems, sap — contains toxic substances, especially cardiac glycosides (such as oleandrin) that can seriously affect the heart. In animals (dogs, cats, horses) and in people, severe consequences are possible if the plant or its parts are ingested. In horses, even a very small amount can be fatal. Symptoms of poisoning can include excessive drooling, vomiting, stomach cramps, heart rhythm disturbances, weakness, and even death if not treated immediately.

Rhododendron

It's decorative, but a tricky shrub for animals. It contains grayanotoxins — it only takes a dog, cat or livestock chewing a couple of leaves for problems to start: excessive drooling, nausea, diarrhea, loss of appetite, weakness, unsteady gait, slowed pulse. In severe cases the animal becomes listless, may temporarily "collapse" on its legs, and without prompt help a coma can follow. If you suspect your pet has swallowed some, remove the plant right away, don't induce vomiting, and contact your vet as soon as possible. The safest approach is to plant rhododendron out of pets' reach, or avoid it altogether if your pets are known to chew on plants.

Lilies

True lilies (the genera Lilium and Hemerocallis, e.g. Asiatic lilies, daylilies) are extremely toxic to cats. Even a very small amount (a leaf, pollen from fur, water from a vase) can cause acute kidney failure within 12–24 hours; without treatment, the outcome can be fatal within 24–72 hours. Dogs usually have milder, mostly gastrointestinal symptoms, with kidney damage being rare.

Typical symptoms of lily poisoning

• Cats (true lilies): within the first 2–6 hours, nausea, vomiting, drooling, lethargy; followed by signs of kidney damage (increased or decreased urination, dehydration, depression). Early treatment dramatically improves the prognosis.
• Dogs: most often mouth irritation, vomiting, diarrhea; with lily of the valley, possible bradycardia, arrhythmias, weakness.

Cyclamen

Cyclamen are often ornamental indoor or garden plants. However, all parts of the plant, especially the underground part (the tuber), contain triterpenoid saponins that can be toxic to dogs and cats.

Typical symptoms of cyclamen poisoning

    Cats are often more sensitive to plant toxins, and with cyclamen the problem is the saponins, most concentrated in the tuber.

• increased drooling (hypersalivation), vomiting (often repeated), diarrhea, stomach pain (restlessness, licking the belly), loss of appetite and lethargy, trembling, weakness,

• with a larger amount ingested (especially if the tuber was eaten):
  • irregular heart rhythm (arrhythmia)
  • difficulty breathing
  • collapse

    Note: In cats that have chewed or eaten part of the tuber, symptoms can appear within a few hours and require urgent veterinary attention.

    Dogs usually develop gastrointestinal symptoms, but if they eat a larger part of the plant (especially the tuber), more serious reactions are possible.

• vomiting and diarrhea, increased drooling, mouth pain and irritation, lethargy, weakness, loss of appetite
  

• in more severe cases:
  

• • slow or irregular heartbeat
    

• • tremors, seizures
    

• • collapse and signs of cardiac arrest (very rare, but possible with a large dose)

    Note: Dogs often eat plants out of curiosity — even a small amount of cyclamen can cause intense vomiting, so a veterinary check-up is always recommended, especially if you suspect it ate the tuber.