Common Poisonous Plants and Household Items for Dogs and Cats

Plants and everyday household products account for a large share of pet poisoning calls every year, and the danger isn't always obvious from looking at a leaf on a windowsill or a bottle under the sink. This guide covers the plants and household items most consistently flagged by veterinary poison control centers as genuinely dangerous, alongside a few widely-feared ones that are actually much milder than their reputation — because knowing the difference matters for how urgently you react.

The Most Dangerous Plant for Cats: True Lilies and Daylilies

If there's one plant every cat owner should be able to recognize, it's this one. According to the ASPCA, lilies in the Lilium and Hemerocallis (daylily) genera — including Easter lilies, tiger lilies, and Asiatic lilies — "can cause acute kidney injury and even death" in cats. Every part of the plant is considered dangerous, including the pollen and the water in a vase, and even a small amount of exposure — a cat brushing against the flower and later grooming pollen off its fur — has been associated with severe kidney damage. Dogs are far less sensitive to true lilies, typically experiencing stomach upset rather than organ damage, but cat households should treat any true lily or daylily as a plant to avoid entirely rather than keep "out of reach," since cats often find ways around that.

Peace lilies, calla lilies, and "lily of the valley" are different plants entirely, despite the shared name, and carry different (and generally less severe, though still worth avoiding) risks — it's the true lilies and daylilies that carry the specific kidney-failure warning.

Sago Palm: Dangerous to Both Dogs and Cats

The sago palm, a popular ornamental plant in warm climates and sometimes sold as an indoor bonsai-style plant elsewhere, contains a toxin called cycasin that the ASPCA lists as toxic to dogs, cats, and horses. Signs include vomiting, dark or bloody stool, jaundice, increased thirst, bruising or abnormal bleeding, and liver damage or liver failure — the ASPCA lists death among the possible outcomes. Published case-series data on sago palm toxicosis in dogs has reported mortality rates as high as 32–50%, though more recent case data collected by the ASPCA Animal Poison Control Center over a ten-year period found a considerably lower rate, which researchers attribute to earlier recognition, faster home decontamination, and improved veterinary treatment — a reminder that speed matters enormously with this particular plant.

Other Plants Worth Knowing

Toxicity varies a great deal by plant and by how much is eaten. The ASPCA's own guidance groups the following among plants worth taking seriously:

• Azaleas and rhododendrons. Small amounts typically cause mild stomach upset, but the ASPCA notes that larger ingestions can cause more severe signs, including irregular heart rhythms and seizures.
• Autumn crocus. Distinct from the spring-blooming crocus, this plant contains colchicine and is associated with severe gastrointestinal signs, organ damage, and bone marrow suppression.
• Cyclamen. The tubers (the root-like base of the plant) are the most concentrated source of toxin and are associated with vomiting and, in larger amounts, more serious cardiac effects.
• Oleander. A common ornamental shrub in warmer climates, oleander contains compounds that affect the heart and is considered dangerous even in small quantities.
• Kalanchoe and dieffenbachia. Kalanchoe (a common flowering succulent) can affect the heart in larger amounts; dieffenbachia (also called "dumb cane") causes intense oral irritation, drooling, and difficulty swallowing due to needle-like crystals in the plant's tissue.
• Tulip and daffodil bulbs. The bulbs carry more concentrated toxins than the leaves or flowers and can cause stomach upset; the ASPCA notes that eating a large piece of bulb also carries a physical blockage risk and, with daffodils specifically, can affect blood pressure.

A few commonly feared houseplants are, per the ASPCA's own descriptions, milder than their reputation suggests: pothos (Devil's ivy), peace lily, and hydrangea typically cause only mouth irritation, drooling, or stomach upset rather than organ damage — worth knowing so a small nibble doesn't trigger unnecessary panic, though a vet call to confirm is still reasonable, especially for a cat, since individual reactions vary.

Household Chemicals and Products

Plants aren't the only common poisoning source. The ASPCA's own toxin-exposure data consistently ranks several household categories among the most frequent calls to poison control:

• Rodenticides (rat and mouse poison). Designed to be palatable to animals, these products can cause internal bleeding, kidney failure, seizures, or death, according to the ASPCA. Different rodenticide formulations work differently, so identifying the exact product is important for treatment.
• Antifreeze (ethylene glycol). Its sweet taste makes it appealing to pets, and even a small amount can cause fatal kidney failure in cats and dogs alike — this is one of the most time-sensitive poisonings there is.
• Over-the-counter and prescription medications. The ASPCA's most recent toxin data lists over-the-counter medications — including ibuprofen, acetaminophen, and cold and flu remedies — as one of the single largest categories of pet poisoning calls, alongside prescription heart medications, antidepressants, and ADHD medications.
• Xylitol. This artificial sweetener isn't limited to food — it also shows up in sugar-free gum, some nut butters, toothpaste, mouthwash, and certain supplements and medications. The FDA warns that xylitol can cause a dangerous drop in a dog's blood sugar within 10 to 60 minutes, with liver damage possible later, sometimes not appearing for 12 to 24 hours. (For chocolate, grapes, and other food-specific dangers, see our companion guide on human foods dogs can and cannot eat, which isn't repeated here.)
• Household cleaning products and insecticides. Toxicity ranges widely — some cause only irritation, while concentrated or corrosive formulas can cause real chemical burns.
• Batteries, especially small button batteries. Beyond the physical choking or blockage risk, a battery that ruptures or lodges against tissue can cause a corrosive chemical burn.
• Fertilizers and lawn or garden chemicals, particularly combination products that pair fertilizer with a pesticide.

If You Suspect an Exposure

1. Move your pet away from the plant or product so they can't get more of it.
2. Try to identify exactly what was involved — the plant's name (a photo helps if you're not sure), or the product's label or packaging — and roughly how much and when.
3. Call your veterinarian, an emergency animal hospital, or a poison control hotline right away: the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661, both staffed 24/7 and both noting a consultation fee may apply.
4. Follow the specific guidance you're given rather than acting on your own — whether monitoring at home or an in-person visit is appropriate depends on exactly what was ingested. Our companion guide on what to do if your dog eats something they shouldn't covers this first-response process, including why inducing vomiting on your own isn't recommended, in more detail.

Reducing the Risk at Home

• Before bringing home a new houseplant, check it against the ASPCA's searchable toxic and non-toxic plant lists rather than assuming based on how common or "harmless-looking" it is.
• Keep true lilies and daylilies out of any household with a cat entirely, rather than just out of reach — cut flower arrangements from a florist or grocery store are a common, easy-to-overlook source.
• Store medications, cleaning products, rodenticides, and garden chemicals behind closed cabinet doors, not on open shelves or counters.
• If you use rodenticides or antifreeze, follow the product's own pet-safety instructions for placement and storage, and clean up any spills immediately.