15 Common Plants That Are Toxic to Cats and Dogs

Many beloved houseplants and garden flowers can cause problems for curious pets. Knowing which plants toxic to cats and dogs are most common helps you place them safely or choose alternatives. This guide covers 15 plants that are commonly listed as toxic, along with the kinds of symptoms they may cause.

Toxicity information varies between sources, and reactions depend on the animal, the amount eaten, and the part of the plant involved. Treat this list as a starting point, and always confirm a plant’s safety with your veterinarian or a trusted pet-poison source, such as the ASPCA Animal Poison Control database. If you suspect your pet has eaten a toxic plant, contact your vet or a pet-poison helpline right away.

Popular Houseplants Commonly Listed as Toxic

1. Pothos. A trailing favorite that is commonly listed as toxic. Chewing it can cause mouth irritation, drooling, and vomiting due to insoluble crystals in the leaves.
2. Philodendron. Like pothos, it contains irritating crystals and is commonly listed as toxic, with similar mouth and stomach symptoms if chewed.
3. Dieffenbachia (dumb cane). Commonly listed as toxic, it can cause intense mouth irritation, drooling, and difficulty swallowing.
4. ZZ plant. A tough, glossy plant that is commonly listed as toxic and may cause stomach upset and irritation if eaten.
5. Snake plant. Popular and hardy, but commonly listed as toxic, with the potential to cause nausea and vomiting.
6. Peace lily. Despite its name, it is not a true lily, but it is commonly listed as toxic and can cause mouth irritation and drooling.

Flowers and Bulbs to Watch

1. True lilies. Lilies in the Lilium and Hemerocallis groups are especially dangerous to cats, where even small amounts can cause serious kidney problems. Keep them out of cat households entirely and consult a vet immediately if ingestion is suspected.
2. Tulips. Commonly listed as toxic, with the bulb being the most concentrated part, potentially causing drooling and stomach upset.
3. Daffodils. The bulbs in particular are commonly listed as toxic and can cause vomiting and other symptoms if eaten.
4. Hyacinth. Commonly listed as toxic, especially the bulb, which may cause drooling, vomiting, and irritation.
5. Amaryllis. A popular winter bloomer that is commonly listed as toxic, with the bulb being the most potent part.

Other Plants to Keep Out of Reach

1. Sago palm. One of the most serious hazards on this list, commonly listed as highly toxic, particularly to dogs, with all parts and especially the seeds posing a danger. Seek veterinary care immediately if eaten.
2. Aloe vera. Useful for people but commonly listed as toxic to pets, potentially causing vomiting and lethargy.
3. Jade plant. A common succulent that is commonly listed as toxic, with the potential to cause vomiting and a slowed heart rate.
4. Oleander. An outdoor shrub that is commonly listed as highly toxic to both pets and people, affecting the heart, so it deserves extra caution.

Why Some Plants Are Toxic

Plants cannot run from the animals that eat them, so many have evolved chemical defenses instead. The irritating crystals found in pothos, philodendron, and dieffenbachia, for example, are tiny needle-like structures that cause an immediate burning sensation in the mouth, which usually stops an animal from eating more. Other plants store compounds that upset the stomach, affect the heart, or damage the kidneys if enough is eaten.

This is why the amount and the part of the plant matter so much. Bulbs often concentrate the most potent compounds, which is why daffodil, tulip, and hyacinth bulbs are more dangerous than their leaves or flowers. A pet that takes a single curious bite of a leaf may show only mild symptoms, while one that digs up and chews a bulb could become much more unwell.

It is also worth remembering that toxicity is not all or nothing. Reactions range from mild drooling and an upset stomach to serious, life-threatening problems, and they depend on the species, the animal’s size, and how much was consumed. When in doubt, it is always safer to treat ingestion seriously and seek advice.

How to Keep Pets Safe Around Plants

The safest approach is a mix of awareness and placement. Identify every plant in your home, ideally by its botanical name, since common names can be confusing. Keep any plant that is commonly listed as toxic well out of reach, and remember that determined cats can climb to places dogs cannot. If you are unsure about a plant, look it up before buying or accept it only if you can place it safely.

Even non-toxic plants can cause mild stomach upset if a pet eats a large amount, so discouraging chewing in general is wise. Offering a pot of pet-safe grass can satisfy the urge to nibble and steer animals away from your other plants.

Safety Tips for Plant Lovers With Pets

• Confirm every plant. Check names against a trusted pet-poison source rather than relying on memory.
• Place toxic plants high. Use shelves, hanging baskets, and closed rooms to keep them away from pets.
• Avoid lilies with cats. Given the severe risk, it is safest to keep true lilies out of homes with cats.
• Watch for warning signs. Drooling, vomiting, lethargy, or loss of appetite after plant contact warrants a call to your vet.
• Keep emergency numbers handy. Save your vet’s number and a pet-poison helpline so you can act quickly.

Final Thoughts

You do not have to give up plants to keep your pets safe, but you do need to know which ones to watch. Learn the common offenders, place them thoughtfully, and confirm anything uncertain with your vet or a trusted pet-poison source so your home stays both green and safe.