Every year, thousands of pets are rushed to emergency veterinary clinics after ingesting something toxic — and in many cases, the culprit is a common household food that the owner had no idea was dangerous. Some of the most harmful substances for pets are things we eat every day without a second thought.
Knowing which foods are dangerous to your pets is genuinely life-saving information. Print this list, share it with your family, and make sure everyone in your household knows which foods to keep well away from your animals.
Extremely Dangerous — Can Be Fatal
Xylitol
Xylitol is an artificial sweetener found in sugar-free gum, candies, some peanut butters, toothpaste, mouthwash, vitamins, some baked goods, and an increasing number of “sugar-free” products. It is extraordinarily toxic to dogs — even small amounts can cause life-threatening hypoglycemia (dangerously low blood sugar) within 30–60 minutes of ingestion, and larger doses cause acute liver failure.
Signs of xylitol toxicity: vomiting, weakness, staggering, seizures, collapse. This is a true emergency — call your veterinarian or emergency animal poison control immediately if you suspect your dog has consumed xylitol.
Always check the ingredient list of any peanut butter before giving it to your dog. Several brands now use xylitol as a sweetener.
Grapes and Raisins
The exact toxic compound in grapes and raisins is still not fully identified, which makes them particularly unpredictable — toxicity doesn’t appear to be dose-dependent in the traditional sense, meaning even a small number of grapes has caused acute kidney failure in some dogs. Because we don’t know why some dogs are severely affected and others are not, all grape and raisin exposure in dogs should be treated as a potential emergency.
Cats appear to be less commonly affected, but the same caution applies.
Never share grapes, raisins, or any foods containing them (trail mix, granola, certain baked goods) with your dog. If your dog eats grapes or raisins, contact your veterinarian immediately even if they seem fine — kidney damage can develop over 24–72 hours.
Chocolate
Chocolate contains theobromine and caffeine, both of which are toxic to dogs and cats. Dogs metabolize theobromine much more slowly than humans, allowing it to accumulate to toxic levels.
Toxicity depends on the type of chocolate and the amount consumed relative to the dog’s body weight. Dark chocolate and baking chocolate contain significantly more theobromine than milk chocolate. White chocolate contains very little theobromine but high amounts of fat and sugar.
Signs of chocolate toxicity: vomiting, diarrhea, excessive thirst and urination, restlessness, muscle tremors, seizures, cardiac arrhythmias. Signs typically develop within 6–12 hours of ingestion.
If your dog eats chocolate, call your veterinarian with information about the type of chocolate, the estimated amount consumed, and your dog’s weight. They can help you determine whether emergency care is needed based on the calculated theobromine dose.
Onions, Garlic, Chives, and Leeks
All members of the Allium family — onions, garlic, chives, leeks, and shallots — are toxic to both dogs and cats. They contain compounds called organosulfoxides that damage red blood cells, causing hemolytic anemia. Cats are more sensitive than dogs, but both species are at risk.
All forms are toxic — raw, cooked, powdered, and dehydrated. Garlic powder and onion powder, commonly found in seasonings, baby food, and many prepared foods, are actually more concentrated and more toxic by weight than fresh garlic or onions.
Toxicity from a single large ingestion is possible, but the more dangerous scenario is chronic low-level exposure — dogs and cats that are regularly given small amounts of food seasoned with onion or garlic powder can develop cumulative toxicity over time.
Signs of Allium toxicity: weakness, lethargy, pale gums, reduced appetite, fainting, orange or red urine. These signs may be delayed 3–5 days after ingestion.
Macadamia Nuts
Macadamia nuts cause a unique syndrome in dogs characterized by weakness and inability to walk (particularly affecting the hind legs), vomiting, tremors, fever, and lethargy. The toxic mechanism is not fully understood.
While macadamia nut toxicity is rarely fatal on its own, it causes significant suffering and the combination with chocolate — as in chocolate-covered macadamia nuts — can be far more serious.
Alcohol
Dogs and cats are dramatically more sensitive to alcohol than humans. Even small amounts of beer, wine, spirits, or foods containing alcohol (certain desserts, fermented fruits) can cause vomiting, disorientation, dangerously low blood sugar, breathing difficulties, low blood pressure, coma, and death.
Never give your pet alcohol under any circumstances, even as a “joke.”
Raw Yeast Dough
Unbaked yeast dough is dangerous in two ways. First, the warm, moist environment of the stomach causes the yeast to continue fermenting, producing carbon dioxide and causing the dough to expand — resulting in painful bloating and potentially life-threatening gastric distension. Second, the fermentation process produces ethanol, which is absorbed into the bloodstream, effectively causing alcohol toxicity.
Moderately Dangerous — Cause Significant Illness
Caffeine
Coffee, tea, energy drinks, caffeine pills, and certain medications all contain caffeine, which is toxic to dogs and cats. Signs are similar to chocolate toxicity — hyperactivity, vomiting, elevated heart rate, tremors, and seizures in severe cases.
Avocado
The flesh of avocado is generally considered low risk for dogs (though the pit, skin, and leaves contain persin, which is toxic). However, avocado is more toxic to birds, rabbits, and other small animals. The high fat content in avocado flesh can trigger pancreatitis in susceptible dogs even if not directly toxic. The pit is a serious choking and intestinal obstruction hazard.
Cooked Bones
Cooked bones — particularly poultry bones — splinter when chewed, creating sharp fragments that can cause lacerations in the mouth, throat, esophagus, stomach, and intestines. They can cause choking, intestinal perforation, and life-threatening obstructions.
Raw bones are generally considered safer (they’re less brittle and more digestible) but are not without risk — they can still cause tooth fractures, intestinal obstruction, and bacterial contamination. Always supervise bone chewing and consult your veterinarian about appropriate bone options.
Nutmeg
Nutmeg contains myristicin, which is toxic to dogs in large amounts, causing disorientation, elevated heart rate, high blood pressure, seizures, and hallucinations. Small amounts found in baked goods are unlikely to cause serious problems, but keep nutmeg and foods with significant nutmeg content away from your pets.
Salt
Excessive salt intake can cause sodium ion toxicosis in dogs and cats — signs include excessive thirst and urination, vomiting, diarrhea, tremors, elevated body temperature, and seizures. Don’t share heavily salted snacks with your pets.
Specifically Dangerous for Cats
Lilies
Certain lily species — Easter lilies, tiger lilies, Asiatic lilies, and daylilies — are extraordinarily toxic to cats. Even small amounts — a few petals, pollen licked from fur, or water from a vase — can cause acute kidney failure in cats. This is a true life-threatening emergency.
If you have cats, do not bring true lilies into your home. If your cat has any exposure to lilies, contact your veterinarian immediately.
Dog Flea and Tick Products
Products containing permethrin — a common ingredient in many dog-specific flea and tick treatments — are highly toxic to cats. Never apply dog flea treatments to cats, and keep cats away from treated dogs until the product has dried completely.
What to Do If Your Pet Eats Something Toxic
Don’t wait for symptoms. Many toxins cause symptoms that are delayed by hours — by the time your pet looks sick, significant damage may have already occurred. Act immediately.
Call your veterinarian or an animal poison control hotline right away:
- ASPCA Animal Poison Control Center: (888) 426-4435 (fee applies)
- Pet Poison Helpline: (855) 764-7661 (fee applies)
Have this information ready: what your pet ate, the estimated amount, your pet’s weight, and any symptoms you’ve observed.
Do not induce vomiting unless specifically instructed to do so by a veterinarian or poison control. In some cases, inducing vomiting can cause additional harm.
→ Read Next: What to Feed Your Dog — A Complete Guide to Canine NutritionThe Bottom Line
Knowledge is the most powerful protection you can give your pet. Share this list with everyone in your household, be particularly vigilant about xylitol-containing products, grapes and raisins, chocolate, and onion family vegetables, and always keep your veterinarian’s number and an emergency poison control number accessible. When in doubt, call — it’s always better to get reassurance from a professional than to wait and see.
Emma Hartwell is a lifelong animal lover, certified pet nutritionist, and experienced dog trainer with over 8 years of hands-on experience working with animals of all kinds. She founded InnerzNews to give pet owners access to honest, practical, and science-backed advice — because every animal deserves the best possible care. When she’s not writing, Emma is hiking with her two rescue dogs, Milo and Biscuit, or volunteering at her local animal shelter.