Is monstera toxic to cats and dogs?

Yes. Monstera is toxic to cats and dogs. The ASPCA lists Monstera deliciosa (filed as cutleaf philodendron, with Swiss cheese plant and split-leaf philodendron among its other names) as toxic to dogs and cats. The cause is insoluble calcium oxalate crystals. A chewed leaf usually means a painful mouth, drooling and maybe vomiting rather than a life-threatening poisoning, but it is still worth a call to your vet or a pet poison line. The rest of this page covers what actually happens, which signs mean you should go in now, and how to live with a monstera and a cat that chews.

Why monstera hurts pets

Monstera belongs to the arum family (Araceae), along with philodendron, pothos, dieffenbachia and alocasia. Their tissue is packed with bundles of needle-shaped calcium oxalate crystals called raphides. They sit inside specialized cells that burst under pressure. When a cat bites a leaf, the cells fire the needles into the lips, tongue and gums. ASPCA's overview of calcium oxalate houseplants explains the mechanism and notes that for most exposures the severity is low.

Two practical consequences:

• Pain is immediate. Most pets drop the leaf after one or two bites, which limits how much they swallow. That is why serious poisonings are uncommon.
• The crystals are "insoluble". This is different from the soluble oxalates in rhubarb leaves or star fruit, which can damage the kidneys. Monstera's raphides cause mechanical and chemical irritation where they touch. They are not a kidney toxin.

Symptoms in cats and dogs

ASPCA lists these clinical signs for monstera: oral irritation, intense burning of the mouth, tongue and lips, excessive drooling, vomiting and difficulty swallowing. Pet Poison Helpline describes the same picture for the closely related philodendrons and adds the rare serious case: throat swelling severe enough to affect breathing.

Cats rarely eat much monstera because it hurts. Dogs, especially puppies, sometimes shred a whole leaf before the pain stops them, so they are a little more likely to vomit.

What to do right now

1. Separate the pet from the plant and pick up the chewed pieces. Note roughly how much is missing. A photo of the plant helps the poison line identify it.
2. Gently clear the mouth. Wipe visible leaf bits from the lips and gums with a damp cloth.
3. Offer water, or a small amount of milk or plain yogurt. ASPCA notes that dairy products can help with calcium oxalate exposures, because calcium binds to the crystals. Don't force-feed anything.
4. Call for advice. Use your vet, ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661. Both lines are open 24/7 and may charge a consultation fee.
5. Do not induce vomiting unless a veterinarian tells you to. The crystals irritate on the way back up too.
6. Go straight to an emergency clinic if breathing changes, the face swells, or the pet collapses.

If a child has chewed the plant, call Poison Control at 1-800-222-1222. Poison Control's plant list includes philodendron and related aroids among plants that are harmful if eaten.

Which parts and which monsteras are toxic?

All of them. Leaves, petioles, stems, aerial roots and the unripe fruit carry raphides, and sap on fur gets licked off later. The ASPCA overview names the whole Swiss cheese plant group (Monstera spp.), so it applies equally to:

• Monstera deliciosa and its variegated forms (Albo, Thai Constellation, Aurea)
• Monstera adansonii (Swiss cheese vine)
• Monstera standleyana, Monstera esqueleto, Monstera obliqua and other collector species
• "Mini monstera" (Rhaphidophora tetrasperma), a different genus in the same family with the same crystals

The ripe fruit is eaten by people in the tropics, but only when fully ripe, and it is not a pet treat. The monstera fruit guide explains why ripeness matters.

Keeping a monstera in a house with pets

Bitter sprays and citrus peels work on some cats and not others, and they wear off. These options are more reliable, from strongest to weakest:

1. Don't keep it where the pet goes. A home office or bedroom with a closed door works well. Monstera only needs bright indirect light, not a specific room.
2. Grow it big, then let it climb. A mature monstera on a moss pole keeps its new, tender leaves 4–6 ft up. Cats mostly chew young, soft growth and dangling aerial roots, so trim aerial roots that hang below 2 ft.
3. Use height for young plants. A sturdy wall shelf works if your cat can't jump to it from furniture. A plant stand is not enough for a cat.
4. Give the cat something better to chew. Cat grass (wheat or oat grass) in a separate pot takes most of the interest off houseplants.
5. Pick up fallen leaves and pruned pieces right away. Sap stays irritating while the tissue is fresh.

If your cat chews plants persistently, a swap is the most honest answer. ASPCA lists spider plant, prayer plant, most calatheas, parlor palm and Boston fern as non-toxic. Our pet-safe plants collection groups them by light level. Before you buy a plant, check its ASPCA entry. The toxic plants collection lists other common houseplants to keep out of reach.

How monstera compares with other toxic houseplants

Monstera is in the "annoying and painful" group, not in the "lethal from a small bite" group. The difference matters if you're deciding whether to rehome a plant. A grown monstera behind a door is a manageable risk. A lily in a house with a cat is not.

For general care of the plant itself, see the monstera care guide.