What Is Toxic to Dogs?
29 common household toxins that can harm your dog. Know the dangers and be prepared.
Quick Answer
If your dog has been exposed to a toxin, call ASPCA Poison Control at 888-426-4435 immediately. Browse common toxins below with severity levels.
🌿 Toxic Plants
Lilies
True lilies (Lilium and Hemerocallis species) are one of the most dangerous plants for cats. Even a small nibble of a leaf, petal, or sip of vase water can cause fatal kidney failure within 24-72 hours.
Sago Palm
Sago palms contain cycasin, which causes severe liver failure. All parts are toxic, but the seeds (nuts) are the most dangerous. The fatality rate is approximately 50% even with aggressive veterinary treatment.
Tulips
Tulips contain allergenic lactones and other compounds, concentrated primarily in the bulb. Ingestion of petals causes mild GI upset, but eating the bulb can cause severe symptoms including cardiac issues.
Azaleas & Rhododendrons
All parts of azaleas and rhododendrons contain grayanotoxins that interfere with sodium channels in cells. Even eating a few leaves can cause serious poisoning in pets.
Oleander
Every part of the oleander plant is extremely toxic, including the smoke from burning it. It contains cardiac glycosides that can cause fatal heart rhythm disturbances. Even drinking water from a vase with oleander is dangerous.
Aloe Vera
While aloe vera gel is used in many human products, the plant contains saponins and anthraquinones that cause GI irritation in pets. The latex layer between the outer leaf and inner gel is the most toxic part.
Poinsettia
Despite their fearsome reputation, poinsettias are only mildly toxic. The milky sap can cause mild mouth and stomach irritation but is very unlikely to cause serious illness. Their danger is greatly exaggerated in popular culture.
Dieffenbachia (Dumb Cane)
Dieffenbachia contains insoluble calcium oxalate crystals that embed in the mouth and throat, causing intense pain and swelling. While rarely fatal, it can cause significant discomfort and difficulty breathing if the tongue or throat swells severely.
Pothos (Devil's Ivy)
Pothos is one of the most popular houseplants and is mildly to moderately toxic to pets. Like dieffenbachia, it contains calcium oxalate crystals that cause oral irritation. It is rarely life-threatening but causes significant discomfort.
Snake Plant (Sansevieria)
Snake plants contain saponins that can cause nausea, vomiting, and diarrhea if ingested. They are only mildly toxic and rarely cause serious problems, but can make pets uncomfortable.
🧪 Chemicals & Pesticides
Antifreeze (Ethylene Glycol)
Antifreeze (ethylene glycol) is one of the most common and deadly pet poisons. It has a sweet taste that attracts animals. As little as 1 teaspoon can kill a cat and 1 tablespoon can kill a small dog. It causes irreversible kidney failure.
Rat & Mouse Poison (Rodenticides)
Rodenticides are designed to kill animals and are extremely dangerous to pets. Different types work differently: anticoagulants cause internal bleeding, bromethalin causes brain swelling, and cholecalciferol causes lethal calcium spikes.
Bleach & Household Cleaners
Dilute household bleach causes mild GI and respiratory irritation. Concentrated bleach or industrial cleaners can cause chemical burns. Fumes alone can be harmful to birds. Always rinse surfaces cleaned with bleach before allowing pet access.
Permethrin (Flea Treatment)
Permethrin is a common ingredient in DOG flea treatments that is extremely toxic to cats. It is the #1 cause of feline poisoning from flea products. Even residue from a treated dog can poison a cat that grooms it.
Slug & Snail Bait (Metaldehyde)
Slug and snail baits containing metaldehyde are extremely attractive to dogs (they are flavored to attract slugs) and cause rapid-onset seizures that are often fatal without immediate treatment.
Lawn Fertilizer
Most lawn fertilizers cause mild GI irritation if ingested. However, fertilizers combined with herbicides, pesticides, or containing blood/bone meal can be more dangerous. Dogs may be attracted to the smell of organic fertilizers.
💊 Human Medications
Ibuprofen (Advil, Motrin)
Ibuprofen is extremely toxic to dogs and cats even in small doses. It causes stomach ulcers, kidney failure, and seizures. Never give human pain medication to pets.
Acetaminophen (Tylenol)
Acetaminophen is one of the most dangerous medications for cats. A single regular-strength Tylenol tablet can kill a cat. Dogs are more tolerant but can still suffer liver failure. Cats lack a crucial liver enzyme needed to process it.
Antidepressants (SSRIs, SNRIs)
Human antidepressants (Prozac, Zoloft, Effexor, Cymbalta) are among the most common pet poisonings. They can cause serotonin syndrome — a potentially fatal overstimulation of the nervous system.
🫧 Essential Oils
Tea Tree Oil (Melaleuca)
Tea tree oil (melaleuca oil) is one of the most toxic essential oils for pets. Even small topical applications can cause serious poisoning. Cats are especially vulnerable as they lack key liver enzymes to metabolize it.
Essential Oils (General)
Many popular essential oils are toxic to pets, particularly cats and birds. Diffusers can be especially dangerous because they disperse micro-droplets that coat fur (cats ingest via grooming) and irritate sensitive bird respiratory systems.
Eucalyptus Oil
Eucalyptus oil contains eucalyptol (1,8-cineole) which is toxic to pets. Both ingestion and inhalation of concentrated eucalyptus can cause poisoning. Fresh eucalyptus branches (popular in home décor) also pose a risk.
🏠 Household Items
Laundry Detergent Pods
Laundry pods contain highly concentrated surfactants that are far more dangerous than regular liquid detergent. When bitten, they burst and release concentrated detergent that can cause chemical burns, respiratory distress, and severe GI irritation.
Batteries
Batteries are dangerous if chewed or swallowed. Button/disc batteries are the most concerning as they can cause severe chemical burns to the esophagus or stomach lining within 15-30 minutes. Larger batteries can cause GI obstruction.
Pennies & Zinc Objects
US pennies minted after 1982 are 97.5% zinc with a copper coating. When swallowed, stomach acid dissolves the zinc, causing zinc toxicosis — a condition that destroys red blood cells and can be fatal.
Teflon / Non-Stick Cookware Fumes
When heated above 536°F (280°C), PTFE-coated (Teflon/non-stick) cookware releases fumes that are immediately lethal to birds. This condition, called "Teflon toxicosis" or PTFE toxicosis, can kill a bird within minutes. The fumes may also cause flu-like symptoms in other pets.
Marijuana / Cannabis / THC
Marijuana toxicity in pets has increased dramatically with legalization. Edibles are the most dangerous form because they often contain chocolate or xylitol in addition to THC. Dogs are the most commonly affected species.
Mothballs
Mothballs are concentrated pesticides that slowly release toxic fumes. They contain either naphthalene or paradichlorobenzene, both of which are toxic to pets. Ingestion or prolonged fume exposure can cause serious poisoning.
Grapes, Raisins & Currants
Grapes, raisins, currants, and sultanas can cause acute kidney failure in dogs. The toxic compound was recently identified as tartaric acid. The amount needed to cause poisoning varies — some dogs are severely affected by just a few grapes.
Frequently Asked Questions
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Trusted sources: ASPCA Poison Control, Pet Poison Helpline, Merck Vet Manual