Are Monstera Plants Toxic to Dogs and What to Do Now

Last Updated on November 1, 2026 by D. Ruddy

If your dog just chewed a leaf from your Monstera deliciosa, you need a clear answer fast. Are monstera plants toxic to dogs? Yes, but the good news is that most cases cause painful mouth irritation rather than life-threatening poisoning.

The plant contains insoluble calcium oxalate crystals that stab and inflame a dog’s mouth, tongue, and throat. This post explains the symptoms, how much is dangerous, what to do right now, and how to keep your dog safe around monsteras.

Yes, monstera plants are toxic to dogs. Every part contains insoluble calcium oxalate crystals, which cause intense oral burning, drooling, pawing at the mouth, and swelling. Most dogs recover with home care, but severe swelling or breathing trouble needs emergency vet attention.

Are Monstera Plants Toxic to Dogs? The Straight Answer

The ASPCA officially lists Monstera deliciosa as toxic to dogs. This plant belongs to the Araceae family, the same plant family as peace lilies, pothos, and calla lilies. The toxic principle is insoluble calcium oxalate crystals, not a poison that attacks the nervous system or organs.

Those crystals are microscopic, needle-like structures called raphides. When a dog bites or chews the plant, the crystals pierce the soft tissue in the mouth and throat. This causes immediate burning and pain.

The reaction is mechanical, not allergic, so it happens the first time a dog chews the plant.

Monstera deliciosa goes by several names, including Swiss cheese plant, split-leaf philodendron, and fruit salad plant. No matter what you call it, the risk stays the same. Every part of the plant is toxic to dogs.

The stem and leaves carry the highest concentration of crystals. Dogs that bite a stem often show stronger symptoms than dogs that only licked a leaf.

• Monstera deliciosa is toxic to dogs according to the ASPCA.
• All parts contain insoluble calcium oxalate crystals.
• The reaction is painful but usually not deadly.
• Severe cases can involve throat swelling and breathing trouble.
• Small dogs and puppies face a higher risk because of their size.
• Dogs with prior mouth injuries or breathing issues need faster care.

According to the ASPCA Animal Poison Control Center, the hotline handles more than 400,000 calls each year, and plant exposures are a common category. Monstera plants are a frequent culprit because they are popular, easy to grow, and tempting for curious dogs.

Why Monstera Leaves and Stems Irritate a Dog’s Mouth

Insoluble calcium oxalate crystals are shaped like tiny needles. They sit inside the plant cells and release when a dog bites down. The crystals embed in the gums, tongue, lips, and throat.

This creates a stinging, burning sensation that can last for hours.

The plant also contains proteolytic enzymes. These enzymes can break down proteins and add to the irritation. The combo of physical needles and chemical enzymes explains why dogs react so quickly.

Some dogs only drool and paw at their mouth. Others develop swollen lips or a swollen tongue. The severity depends on how much plant material was chewed and how sensitive the dog is.

• Raphides are needle-like crystals that puncture oral tissue.
• Proteolytic enzymes may worsen the irritation.
• The sap can irritate skin and eyes as well as the mouth.
• Chewing releases more crystals than licking.
• Swallowing plant pieces can irritate the esophagus and stomach.
• Symptoms often start within minutes of exposure.

Important: The crystals do not get absorbed into the bloodstream the way many poisons do. The main danger is swelling that blocks the airway or severe vomiting that leads to dehydration.

The Pet Poison Helpline reports that insoluble calcium oxalate plants are among the most common plant poisonings in pets. Most cases are mild, but every dog reacts differently.

Symptoms of Monstera Poisoning in Dogs

Mouth pain is the first sign most owners notice. A dog may stop eating, rub its face on the floor, or whine. Drooling is extremely common because the dog cannot swallow comfortably.

Some dogs develop visible swelling of the lips, tongue, or muzzle. In serious cases, the swelling can narrow the airway. That is the emergency scenario to watch for.

Vomiting and diarrhea can happen if the dog swallows plant material. The crystals irritate the stomach lining on the way down. Bloody vomit or severe stomach pain is a red flag.

• Excessive drooling or foaming at the mouth
• Pawing at the mouth, face, or ears
• Whining or crying after eating
• Swollen lips, tongue, or gums
• Redness or bleeding in the mouth
• Refusing food or water
• Vomiting or diarrhea
• Difficulty breathing or noisy breathing
• Lethargy or hiding
• Head shaking or repeated swallowing

Mild symptoms often peak within 30 to 60 minutes. Severe swelling can progress faster. If you see any breathing change, treat it as an emergency.

Warning: Do not wait for symptoms to get worse if your dog has a swollen tongue, noisy breathing, or cannot swallow. Airway swelling can become life-threatening within minutes.

How Much Monstera Does It Take to Make a Dog Sick

There is no safe amount of monstera for a dog. Even a small bite can cause oral pain. The size of the dog and the amount chewed determine how severe the reaction becomes.

A tiny lick may only cause drooling. A few chews can lead to swelling. Eating a whole leaf or stem can trigger vomiting, diarrhea, and severe mouth pain.

Puppies and small breeds are at higher risk. Their mouths and airways are smaller, so even mild swelling can cause big problems. Large dogs may tolerate more plant material, but they are not immune.

These estimates are general. A dog with allergies, asthma, or a sensitive stomach may react more strongly. Always err on the side of caution.

Important: The toxic dose is not measured in ounces or grams like many poisons. It is measured by the dog’s reaction. If your dog is in pain or struggling to breathe, the amount does not matter. Get veterinary help.

According to veterinary toxicologists, insoluble calcium oxalate crystals cause mechanical injury rather than systemic poisoning. That means the mouth and throat are the main battleground, not the liver or kidneys.

What to Do If Your Dog Eats a Monstera Plant

Act quickly but stay calm. Most cases are treatable at home with vet guidance. The first step is to remove your dog from the plant and check the mouth.

1. Move your dog away from the plant. Put the monstera in another room or outside so your dog cannot keep chewing.
2. Look inside the mouth. Check for leaves, stems, swelling, bleeding, or redness. Do not stick your fingers deep into the throat.
3. Rinse the mouth gently. Use a syringe or turkey baster to flush the mouth with plain water. Do not use soap, salt water, or hydrogen peroxide.
4. Offer a small amount of water or milk. Some vets suggest milk or yogurt to coat the mouth. Plain water is fine if your dog will drink.
5. Do not induce vomiting. Vomiting can cause more irritation on the way back up. Only induce vomiting if a vet tells you to.
6. Call your vet or a pet poison hotline. Describe the amount chewed, the time, and your dog’s symptoms. The ASPCA Animal Poison Control Center and Pet Poison Helpline offer 24-hour guidance.
7. Monitor for 24 hours. Watch for swelling, breathing changes, vomiting, or lethargy. Symptoms can worsen before they improve.

Tip: Keep a pet first aid kit with a syringe, saline, gauze, and your vet’s number. A quick mouth rinse can reduce crystal irritation before you reach the clinic.

If your dog swallowed a large piece, the vet may give pain medication, anti-nausea drugs, fluids, or oxygen. Treatment depends on symptoms, not just the amount eaten. Dogs with severe swelling may need to stay overnight for monitoring.

Dog-Safe Alternatives to Monstera Plants

You do not have to give up houseplants. Many beautiful plants are non-toxic to dogs. Swap your monstera for one of these safe options if your dog likes to nibble.

Always check the scientific name before buying. Common names can be misleading. A plant called “philodendron” may look like a monstera but belong to a different species with different toxicity.

These plants still need to be placed out of reach if your dog chews everything. Safe does not mean edible. Eating any plant can cause stomach upset.

1. Check the scientific name, not just the common name.
2. Look up the plant on the ASPCA toxic and non-toxic plant database.
3. Choose a pet-safe plant from a reputable nursery.
4. Place it out of reach during the first few weeks.
5. Watch your dog for chewing or digging.

• Spider plants are hardy and pet-safe.
• Boston ferns add humidity and are non-toxic.
• Areca palms bring a tropical look without the risk.
• Calatheas offer bold patterns and safe leaves.
• Parlor palms work well in small apartments.
• Prayer plants fold their leaves at night and are dog-safe.

If you love the look of monstera, consider a fake plant made from silk or plastic. Just make sure your dog does not chew and swallow the fake leaves. Artificial plants can cause blockages.

How to Dog-Proof Your Home When You Own Monsteras

You can keep monsteras and dogs in the same home with the right setup. The key is separation. Use height, barriers, and training to keep your dog away from the plant.

Place monsteras on high shelves, hanging planters, or in rooms your dog cannot enter. A sturdy plant stand helps, but a determined dog can knock it over. Wall-mounted shelves or ceiling hooks are safer.

Bitter sprays and training can help, but they are not foolproof. A dog with a strong chew drive may ignore the taste. Physical barriers work better than deterrents.

• Put plants on high shelves above dog height.
• Use hanging planters or ceiling hooks.
• Close doors to plant rooms when you leave.
• Use baby gates or pet gates to block access.
• Cover soil with rocks or a mesh screen to stop digging.
• Pick up fallen leaves right away.
• Teach “leave it” and reward your dog for ignoring plants.
• Offer safe chew toys to redirect the behavior.

Repotting is a high-risk time. Stems, leaves, and roots end up on the floor. Put your dog in another room until you clean up every piece.

Tip: Use a tall, heavy pot that a dog cannot tip over. A wide base adds stability and keeps the plant upright if your dog bumps into it.

When to Call the Vet and What Treatment Looks Like

Call your vet for any known monstera ingestion. Even if your dog seems fine, symptoms can start later. A quick phone call helps you decide whether to monitor at home or come in.

Emergency signs include swollen tongue, trouble breathing, repeated vomiting, bloody vomit, collapse, or severe pain. These need immediate care. Do not drive to the vet while your dog is struggling to breathe without calling ahead.

The clinic can prepare oxygen and treatment.

Treatment usually focuses on comfort and supportive care. The vet may rinse the mouth, give pain medication, treat nausea, and provide fluids. In severe cases, oxygen therapy and anti-inflammatory drugs help reduce airway swelling.

According to the ASPCA, most dogs exposed to insoluble calcium oxalate plants recover with supportive care. The Pet Poison Helpline reports that severe cases are less common but possible. Fast action makes a big difference.

Warning: Never give human pain relievers like ibuprofen or acetaminophen to a dog. These drugs can cause serious harm. Only use medications prescribed by your vet.

Frequently Asked Questions

Are monstera plants toxic to dogs if they only chew a leaf?

Yes. Even one chewed leaf can release calcium oxalate crystals that irritate the mouth. Symptoms may include drooling, pawing at the mouth, and mild swelling.

Rinse the mouth and call your vet for guidance.

How long do monstera poisoning symptoms last in dogs?

Mild symptoms often improve within a few hours to 24 hours. Swelling and mouth pain can last longer if the dog chewed a lot of plant material. Severe cases may need several days of veterinary care.

Can a dog die from eating a monstera plant?

Death is rare, but it is possible if severe swelling blocks the airway or if the dog has a severe reaction. Breathing trouble is the main emergency. Get immediate veterinary help if your dog is struggling to breathe.

What should I do if my dog ate monstera fruit?

Call your vet or a pet poison hotline right away. Unripe monstera fruit contains high levels of calcium oxalate crystals and can cause severe mouth pain, drooling, vomiting, and swelling. Ripe fruit is not safe for dogs either.

Are monstera plants safe for dogs to be around without eating them?

Yes, a monstera plant is safe to keep in the home if your dog cannot reach it. The danger comes from chewing or eating the plant. Place it high, use barriers, and pick up fallen leaves immediately.

Final Thoughts

Monstera plants are toxic to dogs because of insoluble calcium oxalate crystals that cause mouth pain, drooling, and swelling. Most dogs recover with quick mouth rinsing and vet guidance. Keep monsteras out of reach, watch for breathing changes, and call your vet right away if your dog chews the plant.