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Poisonous Plants For Dogs: Seasonal, Outdoor & Indoor

Did your dog snack on a houseplant or shrub in your backyard? Are you worried the plant they ingested could be toxic (or life threatening?) Veterinarian Joanna Woodnutt shares a complete list of common household and native plants along with their risk level, symptoms to look for, and more.

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Last Updated: March 16, 2022 | 5 min read

trying to eat a plant with flowers

This article was written by a veterinarian, but it should not serve as a substitute for a visit with a local vet.

Dogs love exploring plants in our homes and gardens, as well as rummaging in the undergrowth on walks. Dogs are omnivores, so they like to eat some plants (as well as meats) – but can plants be harmful to dogs?

Would a dog avoid a toxic plant because it tastes horrible? Not necessarily. Harmful plants don’t always taste bitter, so your dog might not know.

So how do you know which plants could be bad for your dog? And how do you stop your dog from eating them? Let’s take a look along with symptoms and risk levels.

Which Plants Can Harm My Dog?

There are lots of different plants that could cause harm to dogs – symptoms can range from a mild tummy upset to severe illness and death. It’s important you know which plants are the most dangerous and when to call your veterinarian.

There is a comprehensive list of toxic plants on the Cornell College of Agriculture and Life Sciences’ webpages, with handy pictures to help you identify them. These tables list common plants that harm dogs and some of the most poisonous plants for dogs. 

Plants That Are Poisonous Or Dangerous For Dogs

White puppies walking on the yard eating outdoor plant
This is NOT a comprehensive list. Just because a plant is not mentioned here, doesn’t mean it can’t hurt your dog.

Seasonal Plants

SeasonPlantDanger levelSymptomsNotes
SpringSpring bulbs like daffodils, other narcissi, and amaryllisRisk to lifeSickness
Diarrhea
Itchy skin
Dogs that like digging may be more at risk
Larkspur and other delphiniumsRisk to lifeHeart problems
Skin irritation
Tummy upset
Depression
Nervousness
The whole of the plant can be dangerous
SummerOleanderHighHeart problems
Severe sickness
Severe diarrhea
Skin irritation
Often found in parks, by the roadside, and in ornamental gardens. Plants may be brought indoors in cold weather.
FallAmaryllisRisk to lifeSickness
Diarrhea
Skin itchiness
Bulbs are planted in fall to flower for Christmas or outdoors in spring. Bulbs grow
on top of the compost, rather than buried in it, so are easy for dogs to snatch by mistake.
WinterMoldy plantsRisk to lifeSickness
Diarrhea
Fitting (seizures)
Gardens may die back in the winter and plants may rot. Molds can be extremely dangerous to dogs.
FungiRisk to lifeRange of symptoms, depending on the species of fungiThere are lots of different types of fungi that grow in damp, dark conditions. It is very difficult, even for experts, to tell the difference between varieties, and some are extremely toxic, so it’s best to avoid them all.

Outdoor Plants

PlantRisk levelSymptomsNotes
Angel WingsRisk to lifeTummy upset
Difficulty breathing
Trembling
Wobbliness
Pain in the mouth
Fitting
Has soft furry leaves so people plant it in their gardens where they can touch it, which means it will be in a dog’s reach too – so beware!
Castor bean*HIGH*
Risk to life
Skin itchiness
Skin redness
Sickness
Loss of appetite
Drinking more
Only a few castor bean seeds can kill a dog when eaten. Never feed your dog castor oil – and never use it on your dog’s skin – it’s not worth the risk
Water Dropwort or Water HemlockRisk to LifeFitting – violent and painfulThis plant causes illness very quickly
RhododendronRisk to lifeBeing Sick
Feeling Sick
Depression
Difficulty breathing
Coma
YewRisk to LifeDizziness
Dry mouth
Dilated pupils
Berries and leaves are dangerous
WisteriaMediumBeing sick a lot
Bad diarrhea, leading to Dehydration
Collapse
The seeds and seed pods are the toxic part of this plant
Ragwort*HIGH*
Risk to life
Sickness
Diarrhea
Jaundice
Depression
Excessive drinking
Causes irreversible liver damage and even small doses can be fatal

Indoor Plants

PlantRisk levelSymptomsNotes
Dieffenbachia species – Dumbcane, Leopard LilyRisk to lifeDiarrhea
Mouth irritation
Skin irritation
Tightening of the throat
Difficulty breathing
Tremors
Fits
A popular houseplant
CyclamenMediumSickness
Diarrhea
Fits
Paralysis
Cyclamen can be outdoor as well as indoor
AzaleasRisk to lifeSickness
Diarrhea
Difficulty breathing
Coma
All parts of the plant can be toxic and are a risk all year round.
Can be indoors in pots or outdoors.

Can Christmas Plants Hurt My Dog?

Jack Russell Terrier. holidays and celebration, pet in the room the Christmas tree
Is it safe for your dog to kiss (or eat) the mistletoe? 

Christmas plants are lovely to add to the festive spirit, but some of them can cause illness in dogs.

Holly

Berries cause tummy upsets, wobbliness, and fitting in dogs. Leaves are pointy and can injure a dog’s insides.

Ivy

The whole of the plant can cause tummy upsets.

Mistletoe

Mistletoe berries can cause sickness, diarrhea, and skin irritation. This condition is usually treatable in older dogs but can be life-threatening in puppies.

Poinsettia

Poinsettia leaves, stems, and sap can cause sickness, diarrhea, and skin irritation. The sap also irritates (or, in severe cases, blindness) if it gets into a dog’s eyes.

Christmas Trees

Traditional Christmas trees are not toxic to dogs, but they can cause tummy upsets if eaten, and sharp needles can cause damage to a dog’s insides.

Are Human-Safe Plants Dangerous To Dogs?

Can Dogs Eat Avocados
Some plants are safe for humans to eat, but can dogs eat them too?

While it is natural to assume if something is safe for us, it is also safe for our dogs. This is far from the truth. Here are a few examples:

Apricot, Cherry, Peach, And Apple

The seeds or pits inside these fruits contain cyanide, which is toxic to dogs. Apricot kernels are particularly potent. Cyanide poisoning can be life-threatening. This poisonous substance can also be found in apple seeds.

Avocado

The fruit and pit of the avocado are toxic to dogs, causing sickness, diarrhea, and difficulty breathing. The large pit can also cause a blockage in the guts. Both can be life-threatening.

Onion, Leeks, Garlic, And Chives

These plants are examples of alliums which should never be fed to dogs. They damage red blood cells, causing anemia, which can be life-threatening.

Grapes

Grapes cause kidney damage in dogs, and this can be life-threatening. The number of grapes it takes to cause illness is not set – some dogs are seriously ill after only a few. Since raisins are dried grapes, you should avoid feeding them to dogs as well.

Rhubarb

Raw leaves, growing in the garden, can cause fitting and coma if enough is eaten.

My Dog Has Eaten A Toxic Plant – What Should I Do?

Australian Shepherd chewing potted flowers
Don’t stop and smell the roses. See a doctor immediately if your pup ate something it shouldn’t have.

You should call your veterinarian right away if your dog has eaten a plant that you think could cause him harm. Don’t wait for them to become ill. Getting early treatment can be lifesaving.

If your dog gets to the veterinarian promptly, they may induce vomiting. This can stop the body from absorbing harmful toxins and can avoid serious illness. Never attempt to make your dog sick at home. Veterinarians can make dogs sick in a safe way – at-home methods can be dangerous.

If you wait for your dog to become sick before seeking veterinary advice, it may be too late. Once toxins have been absorbed into the body, treatment takes longer, could become very expensive, and may not be successful.

My Dog Has Eaten a Poisonous Plant, What Will My Veterinarian Do?

If the plant your dog has eaten is only likely to cause mild illness, your veterinarian might send them back home with you. They might ask you to watch for new signs of illness, provide medication, or advise special food to help absorb bad things from the gut.

If the toxin is more serious, your vet might want to keep your canine at the clinic. They might give him an injection to make him sick. They may also need further tests, like blood tests or scans, to check for organ damage. Your vet may put your dog on a fluid drip or give specific treatments to help with pain, sickness, diarrhea, breathing difficulties, or fits.

There isn’t a specific cure for a dog that’s eaten a toxic plant – so it’s better to avoid the situation in the first place.

How Can I Stop My Dog From Eating a Harmful Plant?

Beagle dog and potted flowers
A key responsibility of dog parenting is recognizing dangerous plants and keeping them away from your pet.

At home, buy only dog-safe houseplants, and place plant pots and vases out of reach. Don’t risk having plants that are dangerous for dogs, as even if the vase is out of reach, it could still fall over.

In your garden, keep to dog-friendly choices of shrubs and flowers. Fence off areas like vegetable patches if your pup is prone to nibble. If you move to a new home, be sure to check the garden for anything unsafe.

It is more likely that your dog might come across something harmful when you are visiting friends – your guard is down, and the environment is new and stimulating. Be cautious in unfamiliar surroundings and watch your dog carefully.

When on walks, be mindful that toxic plants could be lurking around – flower beds in public parks and fungi growing on fallen trees are common examples.

Frequently Asked Questions

Can dogs eat grass?

Yes –  many dogs like grass. And, contrary to popular belief, they don’t only do it when they feel sick.

Can cut flowers harm my dog?

Yes – certain varieties can be harmful. Lilies are a toxic example.

What should I do if my dog ate a plant, but I don’t know which one?

Call your veterinarian as soon as possible. They may know the risk right away, but if they’re unsure, there are poison helplines that vets can call.

Can eating plants kill a dog?

Sometimes – it depends on the plant. So always call your veterinarian if your dog eats a plant or is unwell and you don’t know why.

Can I spray plants to stop my dog from eating them?

No, very few deterrents work, and they could harm your dog – or your plant. Stick to dog-safe plants and keep questionable ones fenced off and out of your pooch’s reach. Also be careful when spraying weed killer in your yard.

Final Thoughts

Most plants are only bad for dogs when they are eaten. There are a few exceptions, including the popular Christmas plant, poinsettia that has toxic sap (fluid inside the plant), which can cause blindness if it gets into a dog’s eyes. Lilies have toxic pollen (powder from within the flower). Dogs can brush past the flower, get pollen on their fur, then lick themselves and become ill.

Always keep an eye on your pup to make sure whatever they are putting in their mouth is safe. Dogs are curious creatures, and they don’t know what is safe or harmful. So as pet parents it’s our job to keep them protected. If you are worried your pup ate something they shouldn’t have, see a vet or call the ASPCA pet poison hotline immediately.

The information provided through this website should not be used to diagnose or treat a health problem or disease; it is not intended to offer any legal opinion or advice or a substitute for professional safety or care advice. Please consult your health care provider, attorney, insurance expert, or product manual for professional advice. Products and services reviewed are provided by third parties; we are not responsible in any way for them, nor do we guarantee their functionality, utility, safety, or reliability. Our content is for educational purposes only.

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