Plants and foods that are poisonous to dogs

Most dogs are natural scavengers, and it only takes one unattended plate, one dropped tablet or one nibbled houseplant for a trip to the vet to become likely. The good news is that the list of genuinely dangerous foods and plants is well documented, and most poisoning cases are entirely preventable once you know what to look out for.

This guide brings together advice from PDSA, Dogs Trust, Battersea Dogs & Cats Home and the RSPCA to cover the foods, garden and house plants, and everyday household items that are most likely to cause a dog harm. It also covers the signs of poisoning to watch for and exactly what to do if you think your dog has eaten something they shouldn't have.

None of this is meant to make you afraid of your own kitchen or garden. It's simply a reference you can come back to, so that if something goes missing off the worktop or a chewed plant turns up on the lawn, you know straight away whether it's a problem.

The foods that are genuinely dangerous

Grapes, raisins, sultanas and currants

This is one of the most serious food risks for dogs. According to PDSA, grapes, raisins, sultanas and currants contain toxins that are potentially fatal, and in severe cases can cause kidney failure. Toxicity doesn't seem to depend on the dog's size or the amount eaten in a predictable way, which is why vets treat any exposure as an emergency rather than waiting to see if symptoms appear. This includes foods that contain dried fruit, such as Christmas cake, mince pies, hot cross buns and some breakfast cereals or trail mixes.

Chocolate

Chocolate contains theobromine, a stimulant that dogs cannot metabolise as efficiently as humans. Battersea Dogs & Cats Home notes that the darker the chocolate, the higher the theobromine content and the greater the risk, with cooking chocolate and cocoa powder among the most concentrated sources. A large enough dose can cause vomiting, an abnormally fast heart rate, tremors, seizures and in severe cases death, so any chocolate ingestion is worth a call to your vet, especially with small dogs or dark/cooking chocolate.

Onions, garlic, leeks and chives (alliums)

All members of the allium family - onions, garlic, leeks, chives and shallots - contain compounds called organosulphoxides which damage red blood cells and can lead to anaemia. PDSA and Battersea both flag this group, whether raw, cooked, dried, or powdered (as in stock cubes, gravy granules, and many takeaways). Battersea's advice is a useful reminder that symptoms don't always appear straight away - signs of anaemia can take a few days to show, so a dog that seems fine the evening after eating a curry or a roast dinner isn't necessarily in the clear.

Xylitol

Xylitol is an artificial sweetener used in sugar-free gum, some peanut butters, baked goods, toothpaste and diabetic sweets. PDSA describes it as extremely harmful and potentially fatal even in small amounts: in dogs it triggers a rapid, dangerous release of insulin, causing blood sugar to crash, and it can also cause liver failure. Always check the ingredients label before sharing peanut butter with your dog, and keep sugar-free products well out of reach.

Macadamia nuts and other nuts

Macadamia nuts are toxic even in fairly small quantities. Battersea lists weakness, swollen limbs and panting among the effects, and PDSA adds vomiting, tremors and an inability to walk properly to the list of symptoms. Other nuts aren't classed as directly toxic in the same way, but their high fat content puts dogs at risk of an upset stomach or, with repeated exposure, pancreatitis.

Alcohol and caffeine

Alcohol - whether drunk directly or eaten in food, or found in unlikely places like mouthwash, hand sanitiser or unbaked dough - can cause vomiting, disorientation, breathing difficulty, tremors and in serious cases coma. Caffeine, found in tea, coffee, energy drinks and some painkillers, is a stimulant that dogs are far more sensitive to than we are, and PDSA notes it can affect the heart and blood pressure and may cause seizures.

Bones, corn cobs and other blockage risks

Not every food risk is about toxins. PDSA warns that bones, cooked or raw, are hazardous because they can injure the mouth and teeth, damage the throat and oesophagus, cause constipation, or splinter and perforate the stomach or intestines. Corn on the cob is a similar mechanical risk: Battersea notes that while the corn itself digests fine, the cob doesn't, and a swallowed piece can cause a life-threatening intestinal blockage that often needs surgery to clear.

If you're ever unsure whether something in your kitchen is safe to share, our Can My Pet Eat This? tool is a quick way to check before you feed a scrap from the table.

Poisonous plants: the garden

Gardens hold plenty of hidden risks, and a curious puppy exploring with its mouth is at particular risk. Some of the most commonly flagged garden plants include:

• Azaleas and rhododendrons - all parts of the plant are toxic; Battersea lists vomiting and difficulty breathing, and warns it can be fatal even from a small amount.
• Foxgloves - contain cardiac glycosides that can cause severe heart problems and can be fatal.
• Oleander - highly toxic to the heart; even a small amount can be dangerous.
• Yew - Battersea notes dizziness, drooling, vomiting and diarrhoea as symptoms.
• Delphinium - symptoms range from constipation through to heart failure in serious cases.
• Ragwort - linked to kidney damage and liver failure.
• Wisteria - can cause delayed but serious symptoms.
• Sacred bamboo (Nandina) - can cause difficulty breathing, vomiting and collapse.

PDSA also flags horse chestnut (conkers) and oak (acorns) as autumn hazards, since eaten in quantity they can cause a gut blockage, alongside giant hogweed and various wild mushrooms and fungi, which should always be treated as suspect if your dog has been chewing on them.

Spring bulbs

Spring is a particular danger period. Bluebells, daffodils, tulips and narcissus bulbs are all toxic - Battersea groups these as "perennial bulbs" and notes they typically cause vomiting, diarrhoea and mouth irritation, with the bulb itself usually the most concentrated source of toxin. Even water from a vase that's held daffodils can carry enough toxin to make a dog unwell, so it's worth keeping cut flowers somewhere your dog can't reach the water.

If in doubt about a plant, don't wait to see what happens - a quick call to your vet costs nothing and could save a life.

Poisonous plants: in the house

Houseplants cause a steady stream of poisoning calls, in part because they're available to a bored dog all year round. Dogs Trust lists several common culprits, including devil's ivy, English ivy, snake plant, peace lilies, poinsettia, sago palm and geranium. Two are worth calling out specifically:

• Lilies - while true lilies are far more dangerous to cats (causing acute kidney failure), Battersea notes dogs can still experience vomiting, diarrhoea, loss of appetite and drooling if they eat any part of the plant.
• Sago palm - among the most dangerous houseplants for dogs; PDSA and Dogs Trust both note it can cause diarrhoea (sometimes with blood), constipation and liver damage, and can be fatal.

Aloe vera and lavender are commonly kept indoors too and both appear on toxic-plant lists, generally causing stomach upset rather than anything more severe, but it's still safest to keep them out of reach. If you want to grow something dog-safe, Dogs Trust suggests rosemary, sage, calendula, cornflowers, sunflowers and hibiscus as generally safe alternatives - though it's always worth double-checking an individual plant before assuming it's fine.

Household and garden chemical hazards

Poisoning isn't only about plants and plates. Dogs Trust and PDSA both list a long line-up of everyday hazards worth dog-proofing against:

• Human medication - paracetamol, ibuprofen and other NSAIDs, aspirin, antidepressants and sleeping tablets are all dangerous to dogs even at doses that seem small to us. Never give your dog any human medicine without your vet's explicit instruction.
• Antifreeze - PDSA is blunt about this one: even the smallest amounts can cause kidney failure and can be fatal. Its sweet taste can make it appealing to dogs, so any spill should be cleaned up immediately.
• Slug and snail pellets - metaldehyde-based pellets are fatal within hours if eaten in sufficient quantity; RSPCA identifies metaldehyde poisoning as one of the most common causes of poisoning deaths reported to the Veterinary Poisons Information Service.
• Rat and mouse poison - causes internal bleeding, coughing, vomiting and seizures, sometimes with a delay of a few days before symptoms show.
• Vitamin D supplements - excessive doses can cause kidney failure.
• Vapes and e-cigarettes - the concentrated nicotine in refill liquid is highly toxic even in tiny quantities.
• Cleaning products - bleach, dishwasher tablets, drain cleaner and descaler can cause burns to the mouth and gut as well as gastrointestinal symptoms.
• Batteries - chewed batteries can cause chemical burns to the mouth, throat and stomach.
• Rock salt and grit - a winter hazard; wipe paws after walks on gritted pavements, as per RSPCA guidance.

Signs your dog may have eaten something poisonous

Symptoms vary hugely depending on what's been eaten, but common signs to watch for include:

• Vomiting or diarrhoea, sometimes with blood
• Drooling or foaming at the mouth
• Lethargy, weakness or collapse
• Twitching, tremors or seizures
• Loss of coordination or an unsteady walk
• Rapid or irregular heartbeat
• Swelling of the mouth, tongue or throat
• Loss of appetite

Some poisons act within minutes; others, like allium (onion/garlic) toxicity or certain rodenticides, can take days to show visible signs, which is exactly why vets recommend acting on the ingestion itself rather than waiting for symptoms.

What to do if you think your dog has been poisoned

The advice from PDSA, Dogs Trust, Battersea and the RSPCA is consistent on this point: contact your vet immediately if you suspect your dog has eaten something poisonous. Don't wait to see if they seem unwell first.

A few practical steps:

• Move your dog away from the substance or plant so they can't eat any more of it.
• Call your vet or the nearest emergency vet straight away, even outside normal hours.
• Bring information with you - the packaging, plant, or an idea of the brand name and ingredients, roughly how much was eaten, when, and your dog's approximate weight, as RSPCA recommends.
• Never try to make your dog sick yourself. The RSPCA is explicit that owners should never attempt to induce vomiting - some substances cause more damage coming back up, and only a vet can judge when this is appropriate.
• Don't "watch and wait." Several of these poisons have a narrow treatment window, and starting treatment before symptoms appear often gives the best outcome.

Common mistakes owners make

A few patterns come up again and again in poisoning cases:

• Assuming small amounts are safe. With grapes, raisins, xylitol and some plants, there's no reliably "safe" small dose - vets treat any exposure seriously.
• Not checking ingredient labels. Xylitol in particular hides in products that look harmless, such as peanut butter, some yoghurts and sugar-free gum.
• Forgetting about delayed symptoms. A dog that seems completely fine a few hours after eating onions or a rodenticide bait can still be building towards serious illness.
• Leaving bins accessible. Mouldy food produces mycotoxins that can cause vomiting, tremors and seizures, and bins are one of the most common sources of accidental poisoning.
• Assuming garden plants are automatically dog-safe just because they're common. Daffodil bulbs, bluebells and yew are all garden or hedgerow regulars, not exotic rarities.

A simple poison-safe checklist

• Keep chocolate, dried fruit, onions/garlic and anything containing xylitol well out of paw's reach, including on countertops and in bags.
• Store all human medication in a closed cabinet, never on a bedside table or in an easily knocked-over bag.
• Check any new houseplant against a toxic plant list before bringing it home.
• Fence off or supervise access to sago palms, foxgloves, azaleas and daffodil beds.
• Keep antifreeze, slug pellets and rodenticides in sealed containers on a high shelf, and clean up spills immediately.
• Put your vet's number and the nearest emergency vet's number somewhere you can find them quickly - not just saved in a phone that might be hard to unlock in a panic.
• After walks in autumn, check your dog hasn't been chewing conkers or acorns; after gritted winter walks, wipe their paws.

When to see your vet

Treat any suspected ingestion of the substances above as an emergency, even if your dog seems bright and well. Call your vet or nearest emergency practice straight away, describe exactly what and how much was eaten (or might have been eaten) and when, and follow their instructions - which may include coming in immediately even before symptoms develop. If your dog is already showing signs such as vomiting, seizures, collapse, or swelling of the mouth or throat, this is always an emergency and needs immediate veterinary attention.

*This is general guidance, not a substitute for advice from your vet, who can assess your individual pet.*

Sources

• PDSA — poisons and hazards for pets, including toxic foods, plants and household substances (pdsa.org.uk).
• Dogs Trust — toxic household items and plants for dogs (dogstrust.org.uk).
• Battersea Dogs & Cats Home — toxic food for dogs (battersea.org.uk).
• Battersea Dogs & Cats Home — plants that are poisonous to dogs (battersea.org.uk).
• RSPCA — dog poisoning advice, common poisons and what to do (rspca.org.uk).