A Complete List of Common Pet Toxins and Poisons for Dogs and Cats

Pets are naturally curious and that curiosity can sometimes lead them straight into something dangerous. There are dozens of everyday items that can be toxic or even fatal to dogs and cats, and many pet parents don’t realize how many common household items pose a serious risk until it’s too late.

Foods that are toxic to dogs and cats

Some of the most dangerous toxins for pets are hiding in plain sight right in your kitchen. Foods that are completely safe (or even healthy) for humans can cause serious harm to dogs and cats.

Dangerous for both dogs and cats

• Chocolate: Contains theobromine and caffeine, which can cause vomiting, tremors, seizures, and heart arrhythmias. According to Trupanion data, more than 8,300 pets have been treated for chocolate toxicity since 2020.
• Caffeine: Coffee, tea, energy drinks, and some medications contain caffeine, which can cause rapid heart rate, restlessness, tremors, and seizures.
• Onions, garlic, leeks, and chives: Damage red blood cells and can lead to hemolytic anemia. Toxic in all forms — raw, cooked, or powdered.
• Alcohol: Even small amounts can cause vomiting, disorientation, difficulty breathing, and life-threatening drops in blood sugar.
• Raw yeast dough: Expands in the stomach and produces alcohol as it ferments, causing bloat and alcohol toxicity.

More dangerous for dogs

• Xylitol (Birch bark extract and birch sugar): An artificial sweetener found in sugar-free gum, candy, and some peanut butters. Even small amounts can cause a dangerous drop in blood sugar and liver failure.
• Grapes and raisins: Can cause acute kidney failure in dogs, even in small quantities. The exact toxic mechanism is still being studied.
• Macadamia nuts: Can cause weakness, hyperthermia, vomiting, and tremors in dogs.
• Onions, garlic, leeks, and chives: Damage red blood cells and can lead to hemolytic anemia. Toxic in all forms — raw, cooked, or powdered.
• Avocado: The flesh, pit, skin, and leaves contain persin, which can cause vomiting and diarrhea in dogs.

Not necessarily toxic, but worth noting

• Tuna (in excess): Can lead to mercury poisoning and nutritional deficiencies if fed regularly as a primary diet.
• Raw fish: Can destroy thiamine (vitamin B1), leading to neurological problems.
• Dairy products: Most cats are lactose intolerant and can experience digestive upset from milk and cheese.

Human medications that can poison pets

Prescription and over-the-counter medications meant for people are among the most common causes of pet poisoning. Human medications consistently rank at the top of pet poison calls every year.

• NSAIDs (ibuprofen, naproxen): Can cause stomach ulcers and acute kidney failure in both dogs and cats.
• Acetaminophen (Tylenol): Extremely toxic to cats, causing severe liver damage and destruction of red blood cells. Also dangerous in dogs at high doses.
• Antidepressants: Can cause sedation, tremors, and in severe cases, seizures.
• ADD/ADHD medications: Stimulants like amphetamines can cause elevated heart rate, tremors, and life-threatening hyperthermia.
• Sleep aids and muscle relaxants: Can cause severe sedation, respiratory depression, and loss of coordination.
• Heart medications (beta-blockers, calcium channel blockers): Even small doses can cause dangerous drops in heart rate and blood pressure in pets.

Always store medications in closed cabinets out of reach and never give your pet a human medication without direct guidance from your veterinarian.

Household products that are dangerous for pets

Many everyday cleaning products, personal care items, and home maintenance supplies are toxic to dogs and cats. Pets can be exposed through direct ingestion, skin contact, or inhaling fumes.

• Cleaning products: Bleach, ammonia-based cleaners, and disinfectant sprays can cause chemical burns to the mouth, throat, and stomach.
• Laundry detergent pods: Highly concentrated and can cause severe vomiting, respiratory distress, and neurological symptoms.
• Antifreeze (ethylene glycol): Has a sweet taste that attracts pets. Even a teaspoon can cause fatal kidney failure in cats; slightly more is lethal to dogs.
• Rodenticides (rat and mouse poison): Designed to be palatable, making them especially dangerous. Depending on the type, they can cause internal bleeding, kidney failure, or seizures.
• Insecticides and pesticides: Including flea and tick products formulated for dogs can be highly toxic to cats. Always check labels carefully.
• Essential oils: Tea tree oil, eucalyptus, peppermint, and others can be toxic to cats in particular, causing neurological symptoms even in small amounts.

Poisonous plants for dogs and cats

Whether indoors or in the garden, many common plants are toxic to pets. Some cause mild gastrointestinal upset, while others can cause organ failure or death.

Toxic to both dogs and cats

• Lilies (especially Easter, Tiger, and Day lilies): Extremely toxic to cats and can cause acute kidney failure. Also harmful to dogs.
• Sago palm: All parts are toxic, but the seeds are especially dangerous, causing liver failure in both dogs and cats.
• Azalea and rhododendron: Can cause vomiting, drooling, heart arrhythmias, and collapse.
• Oleander: Even small amounts can cause severe heart problems.
• Dieffenbachia (dumb cane): Causes intense burning and swelling in the mouth and throat.

Common indoor plants to watch

• Pothos, philodendron, and peace lily: Contain calcium oxalate crystals that irritate the mouth and GI tract.
• Aloe vera: Can cause vomiting, diarrhea, and lethargy in dogs and cats despite its reputation as a skin soother.
• Snake plant (Sansevieria): Mildly toxic, causing nausea and vomiting.

Outdoor, garden, and seasonal toxins

The outdoors introduces its own set of hazards, and some risks spike during specific seasons.

• Fertilizers: Many lawn and garden fertilizers contain iron, nitrogen, and other compounds that are harmful if ingested.
• Herbicides: Products like weed killers can coat paws and grass, leading to ingestion during grooming.
• Mushrooms: While most wild mushrooms are harmless, certain species (like Amanita) are deadly to dogs and cats.
• Compost bins: Decomposing organic matter can contain tremorgenic mycotoxins, which cause severe muscle tremors.
• Ice melt and road salt: Can irritate and crack paw pads and cause GI upset if licked off. Look for pet-safe alternatives in winter.
• Marijuana: As cannabis becomes more widely available, accidental exposure is rising. Trupanion data shows marijuana toxicity has affected nearly 1,900 pets. Even secondhand smoke can affect dogs and cats, and edibles pose compounded risks from other toxic ingredients like chocolate or xylitol.

Do toxins affect dogs and cats differently?

Yes — and this is an important distinction many pet parents overlook. Dogs and cats metabolize substances differently, which means a toxin that causes mild symptoms in a dog can be fatal to a cat, and vice versa.

• Cats lack certain liver enzymes that help process and eliminate many toxins, making them especially sensitive to acetaminophen, aspirin, essential oils, and certain insecticides.
• Dogs are more likely to eat large quantities of something toxic due to their scavenging nature, which can make dose-related toxins like chocolate and grapes particularly dangerous.
• Never assume a product is safe for cats because it is labeled for dogs, or assume a food is safe because it doesn’t affect humans.

When in doubt, treat any potential exposure as an emergency and contact your veterinarian for guidance specific to your pet’s species, size, and health history.

Signs of poisoning in dogs and cats

Symptoms of poisoning vary widely depending on the toxin, the amount consumed, and the size of your pet.

Common signs to watch for include:

• Vomiting or diarrhea, sometimes with blood
• Excessive drooling or foaming at the mouth
• Tremors, muscle twitching, or seizures
• Loss of coordination or stumbling
• Lethargy, sudden weakness, or collapse
• Difficulty breathing or rapid breathing
• Pale or yellow-tinged gums
• Dilated pupils or changes in eye appearance
• Loss of appetite or sudden behavioral changes
• Excessive urination or complete loss of bladder control

Some toxins cause symptoms within minutes, while others — particularly those that affect the kidneys or liver — may take hours or days to produce visible signs. Never wait to see if symptoms improve on their own.

What to do if you think your pet was poisoned

Acting quickly is essential. Here’s what to do if you suspect your dog or cat has been exposed to a toxin:

• Stay calm and remove your pet from the source. If the toxin is still accessible, move your pet away from it immediately.
• Call your veterinarian or an emergency animal hospital right away. Don’t wait for symptoms to develop or worsen.
• Contact the Pet Poison Helpline (1-855-764-7661). Available 24/7, though a consultation fee may apply. The ASPCA Animal Poison Control Center (888-426-4435) is another option.
• Bring the product or packaging with you to the vet. The ingredient list, concentration, and amount consumed will help your vet determine the best course of treatment.
• Do not induce vomiting unless directed by a veterinarian. In some cases, inducing vomiting can make the situation worse, particularly with caustic substances.
• Be honest about what your pet was exposed to. Your vet is there to help, not to judge. Accurate information leads to faster, better care.

A little preparation goes a long way

Even the most attentive pet parents get caught off guard sometimes. Pets are quick, curious, and completely unbothered by the concept of "that's not for you." An unattended grape, a houseplant they've never touched before, a pill that rolled under the couch are all things that happen, and they're not a reflection of how much you love your pet.

Having pet insurance in place like Trupanion means that if you do find yourself in an emergency, you're not weighing the cost of care against the care itself. Toxicity emergencies can involve a lot — fluids, bloodwork, monitoring, an overnight stay — and knowing that's covered lets you focus on what actually matters in that moment.