Dozens of everyday items in your home can poison a dog, from a dropped ibuprofen tablet to a chocolate bar left on the counter. Over-the-counter medications and human foods together account for roughly a third of all pet poisoning cases reported to the ASPCA Animal Poison Control Center each year. Knowing which substances are dangerous, and how little it can take, helps you prevent emergencies before they happen.
Human Medications
Over-the-counter painkillers are the single most common cause of dog poisoning, making up 16.5% of all cases reported to the ASPCA in 2024. Dogs metabolize these drugs very differently than people do, so even a single pill can cause serious harm depending on the dog’s size.
Ibuprofen is one of the worst offenders. A dose as low as 100 mg per kilogram of body weight (roughly two standard tablets for a 20-pound dog) can cause vomiting, diarrhea, and abdominal pain. Higher amounts damage the kidneys, and doses above 600 mg/kg can be fatal. Acetaminophen targets the liver in dogs, with toxic effects starting around 100 mg/kg. At higher doses it interferes with the blood’s ability to carry oxygen. Naproxen is even more dangerous at lower amounts, causing bloody vomit and severe gut damage after just a few days of relatively small doses.
Prescription medications are the third most common poisoning category overall. Heart medications, antidepressants, and ADHD drugs top that list. If your dog gets into any pill bottle, knowing exactly which medication and how many tablets are missing helps a veterinarian act quickly.
Chocolate
Chocolate contains a stimulant compound called theobromine that dogs break down much more slowly than humans. The darker the chocolate, the more theobromine it contains. Baking chocolate and dark chocolate are the most dangerous; milk chocolate is less concentrated but still risky in larger amounts; white chocolate contains almost none.
Mild symptoms like restlessness and vomiting can appear at about 20 mg of theobromine per kilogram of body weight. Severe signs, including a racing heart and muscle tremors, show up around 40 to 50 mg/kg. Seizures become a risk above 60 mg/kg, and lethal doses fall in the range of 100 to 200 mg/kg. For context, a single ounce of baking chocolate contains roughly 450 mg of theobromine, so even a small amount can push a medium-sized dog into dangerous territory. Chocolate accounted for 13.6% of all poisoning cases reported in 2024.
Grapes and Raisins
Grapes and raisins cause acute kidney failure in dogs, and there is no reliably safe amount. Some dogs eat a handful and develop life-threatening kidney injury within days, while others seem unaffected. Scientists recently identified tartaric acid as the likely toxic agent, though the exact mechanism is still not fully understood. Raisins are more concentrated than fresh grapes, so smaller quantities can do more damage. Cream of tartar and tamarinds, which also contain tartaric acid, have caused the same kidney injury in dogs.
Xylitol (Birch Sugar)
Xylitol is a sugar substitute found in sugar-free gum, candy, peanut butter, baked goods, toothpaste, and some protein bars. In dogs, xylitol triggers a massive release of insulin that can crash blood sugar to dangerous levels within 10 to 60 minutes of ingestion. Symptoms include vomiting, weakness, stumbling, and collapse. In some cases, liver failure develops 12 to 24 hours later, sometimes without earlier warning signs. This is one of the most time-sensitive poisoning emergencies because blood sugar can drop fast. Xylitol now also appears on labels under the name “birch sugar” or “birch sap,” so check ingredient lists carefully on any sugar-free product.
Onions, Garlic, and Related Plants
All plants in the allium family are toxic to dogs. That includes onions, garlic, leeks, chives, and shallots, whether raw, cooked, powdered, or dehydrated. These foods contain compounds that damage red blood cells, leading to a type of anemia where the cells can no longer carry oxygen properly. In dogs, eating roughly 15 to 30 grams of raw onion per kilogram of body weight causes clinical symptoms. Damage to red blood cells begins within 24 hours and peaks around 72 hours after ingestion.
Garlic is more concentrated than onion, so smaller amounts can cause problems. Watch for lethargy, pale gums, dark-colored urine, and rapid breathing in the days following exposure. Many prepared foods contain onion or garlic powder, which makes table scraps riskier than they might seem.
Toxic Plants
Sago palm is one of the most dangerous common household and landscaping plants for dogs. Every part of the plant is toxic, but the seeds (sometimes called nuts) contain the highest concentration of harmful compounds. The reported mortality rate in dogs that develop symptoms after eating sago palm is 32%. The toxins cause severe liver damage, and signs like vomiting, bloody stool, and jaundice can appear within hours to days.
Other plants to keep away from dogs include lilies (especially toxic to cats, but some varieties affect dogs too), oleander, azaleas, rhododendrons, and tulip bulbs. If you’re unsure about a specific plant, the ASPCA maintains a searchable database of toxic and nontoxic plants.
Essential Oils
Many essential oils are poisonous to dogs whether ingested, absorbed through the skin, or inhaled in concentrated form from a diffuser in a small room. The most commonly reported toxic oils include tea tree (melaleuca), peppermint, cinnamon, citrus, pine, wintergreen, pennyroyal, sweet birch, and ylang ylang.
Signs of essential oil poisoning include drooling, vomiting, difficulty walking, muscle tremors, lethargy, and difficulty breathing. You may also notice the scent of the oil on your dog’s coat, skin, or breath. Burns or redness on the lips, gums, or tongue can occur with direct contact. Even passive exposure from a diffuser can affect small dogs or dogs with respiratory issues, so use diffusers in well-ventilated areas your dog can leave freely.
Rat and Mouse Poison
Rodenticides are designed to be appealing to animals, which makes them especially dangerous to dogs. The two most common types work very differently. Anticoagulant rodenticides prevent blood from clotting, leading to internal bleeding that may not become obvious for several days. Newer cholecalciferol-based rodenticides (vitamin D3) cause calcium and phosphorus levels to spike, leading to acute kidney failure. With cholecalciferol poisoning, symptoms like increased thirst, lethargy, loss of appetite, and bad breath typically appear one to two days after ingestion, by which point significant kidney damage may already be done.
If your dog eats rat poison, try to identify the product name and active ingredient on the packaging. Different types require completely different treatments, and the product label gives a veterinarian critical information.
What to Do If Your Dog Eats Something Toxic
For recent ingestions (generally within the last one to two hours), a veterinarian may recommend inducing vomiting. The standard method for dogs is 3% hydrogen peroxide given by mouth at about 1 milliliter per pound of body weight, up to a maximum of 45 milliliters. The dose can be repeated once if vomiting doesn’t happen within 5 to 10 minutes. Do not induce vomiting if your dog swallowed something caustic like bleach, drain cleaner, or petroleum-based products, as these cause additional damage on the way back up.
Before doing anything, call your veterinarian or the ASPCA Animal Poison Control Center (888-426-4435). Have the product packaging or a photo of it ready, along with your best estimate of how much your dog ate and when. Speed matters with most poisonings, especially xylitol and chocolate, where the window to intervene is short.