Is Monstera (Swiss Cheese Plant) Toxic to Cats and Dogs?
Yes, the popular houseplant Monstera, also known as the Swiss Cheese Plant, is toxic to both cats and dogs. The plant contains insoluble calcium oxalate crystals, which can cause an immediate and painful reaction if a pet chews on or bites any part of the leaves or stems.
This toxicity is due to microscopic, needle-shaped crystals that embed themselves in the soft tissues of the mouth, tongue, and throat. The resulting irritation is a physical reaction rather than a systemic poisoning. Understanding the specific effects of these crystals can help pet owners recognize the signs and take appropriate steps to keep their animals safe.
Monstera (Swiss Cheese Plant): what the ASPCA database lists
| ASPCA entry | Swiss Cheese Plant |
|---|---|
| Other common names | Cutleaf Philodendron, Hurricane Plant, Ceriman, Mexican Breadfruit |
| Scientific name | Monstera deliciosa |
| Family | Araceae |
| Toxic to | Toxic to Dogs, Toxic to Cats |
| Non-toxic to | None listed |
| Toxic principles | Insoluble calcium oxalates |
| Clinical signs listed | Oral irritation, intense burning and irritation of mouth, tongue and lips, excessive drooling, vomiting, difficulty swallowing. |
What the ASPCA says about Monstera toxicity
The American Society for the Prevention of Cruelty to Animals (ASPCA) lists the Swiss Cheese Plant, or Monstera deliciosa, as toxic to cats and dogs. The plant is a member of the Araceae family. Other common names for this plant include Cutleaf Philodendron, Hurricane Plant, Ceriman, and Mexican Breadfruit.
The toxic principle identified by the ASPCA is insoluble calcium oxalates. The clinical signs associated with a pet chewing on the plant include:
- Oral irritation
- Intense burning and irritation of the mouth, tongue, and lips
- Excessive drooling
- Vomiting
- Difficulty swallowing
These symptoms are a direct result of the sharp crystals causing micro-trauma to the delicate tissues in a pet’s mouth and digestive tract.
What this means in a home with pets
When a cat or dog bites or chews on a Monstera plant, the calcium oxalate crystals are released and immediately cause discomfort and pain. This painful sensation usually prevents most pets from ingesting a large quantity of the plant material. Even a small exploratory nibble can be enough to trigger a significant reaction.
A pet that has come into contact with the plant may paw at its face, drool profusely, or vocalize due to the irritation in its mouth. Vomiting can occur if the pet manages to swallow some of the plant. These signs indicate the animal is in considerable distress and pain.
Keeping cats, dogs, and this plant apart
The most effective way to prevent a toxic exposure is to ensure your pets cannot access the plant. Place your Monstera in a room that is off-limits to your pets. Alternatively, use high shelving, hanging planters, or plant stands that keep the leaves and stems completely out of reach. Be mindful that cats are skilled climbers and can often access areas you might think are safe.
Supervise your pets, especially if you bring a new plant into your home. Regularly check your plant for any signs of chewing or missing pieces. If your pet shows an unusual interest in plants, consider providing safe alternatives like cat grass to redirect their attention. Always read the labels of any new plants you bring home to confirm they are safe for your specific pets.
When to call your vet
If your pet chewed or ate part of this plant, call your veterinarian or an animal poison control line. Note which plant and which part, how much may be gone and when, and take a photo or a piece of the plant with you.
If you suspect your cat or dog has chewed on a Monstera plant, contact your veterinarian or the ASPCA Animal Poison Control Center immediately. Note the time of exposure and how much of the plant you believe was ingested. Do not attempt to induce vomiting or provide any home remedies without professional guidance.
Emergency signs: go now
- Collapse, fainting or severe weakness
- Seizures, tremors or trouble standing
- Trouble breathing or blue, gray or very pale gums
- Repeated vomiting or retching, or a swollen, painful belly
- Any known contact with a substance listed as toxic, even before signs appear
Book an appointment soon
- Vomiting or diarrhea that lasts or keeps coming back
- Not eating or drinking, or drinking much more than usual
- Drooling, pawing at the mouth or a swollen face
- Lethargy, hiding or acting unlike themselves
ASPCA Animal Poison Control Center: (888) 426-4435 (a consultation fee may apply). Your own vet or nearest emergency clinic is always a good first call.
Sources
Last checked October 21, 2026. Listings and guidance can change; your veterinarian knows your pet’s health history.