The foods dogs must never eat are chocolate, xylitol (also labelled birch sugar), grapes and raisins, onions and garlic, macadamia nuts, alcohol, raw yeast dough, caffeine, and anything mouldy. Xylitol and grapes are the two most urgent — both can cause life-threatening damage from a small amount, and neither has a reliable “safe” dose. If your dog has eaten something on this list, call your vet or a poison helpline now rather than waiting for symptoms.
The emergency numbers, first
ASPCA Animal Poison Control: (888) 426-4435. Pet Poison Helpline: (855) 764-7661. Both are staffed around the clock and both may charge a consultation fee. Have the packaging, your dog’s weight, and roughly how much was eaten and when.
Do not induce vomiting unless a vet tells you to. With some substances — anything caustic, or a dog who is already unsteady — making them vomit causes a second injury on the way back up.
The 20 foods dogs cannot eat
These are the ones with real, documented toxicity, roughly in order of how urgently they need a phone call.
| Food | Why it is dangerous | Urgency |
|---|---|---|
| Xylitol / birch sugar | Crashes blood sugar within minutes; can cause liver failure | Call immediately |
| Grapes, raisins, sultanas, currants | Acute kidney injury; no established safe amount | Call immediately |
| Chocolate | Theobromine and caffeine; darker is far worse than milk | Call immediately |
| Onion, garlic, leek, chive, shallot | Damage red blood cells; cooked and powdered forms count | Call same day |
| Macadamia nuts | Weakness, tremors, hind-leg wobbliness, fever | Call same day |
| Alcohol | Rapid intoxication; small volumes matter in small dogs | Call immediately |
| Raw bread or pizza dough | Expands in the stomach and ferments into alcohol | Call immediately |
| Coffee, tea, energy drinks | Caffeine; grounds and pods are the usual culprits | Call immediately |
| Mouldy food and compost | Mycotoxins cause severe tremors and seizures | Call immediately |
| Wild mushrooms | Some species cause liver failure; identification is unreliable | Call immediately |
| Cooked bones | Splinter into sharp fragments; choking and perforation risk | Call same day |
| Fatty trimmings, bacon, drippings | Trigger pancreatitis, which can be severe | Watch closely |
| Salty snacks, play dough, salt dough | Salt toxicity; homemade dough ornaments are a classic case | Call same day |
| Avocado | Persin causes upset; the pit is a genuine obstruction risk | Watch closely |
| Nutmeg | Myristicin causes disorientation and a raised heart rate | Call same day |
| Green tomato and potato, and their leaves | Solanine in the unripe and green parts | Watch closely |
| Rhubarb leaves | Oxalates affect kidneys and calcium levels | Call same day |
| Hops (home brewing) | Can cause a dangerous spike in body temperature | Call immediately |
| Corn cobs | Not toxic, but a leading cause of intestinal blockage | Call same day |
| Milk, cream and soft cheese in quantity | Most adult dogs are lactose intolerant; fat content adds risk | Watch closely |
The two that catch people out
Xylitol is the most under-appreciated hazard in the average kitchen. It is in sugar-free gum, mints, peanut butter, protein bars, some supplements and some toothpastes, and it is increasingly labelled as “birch sugar” rather than xylitol. Always read the ingredient list on peanut butter before it goes in a food toy.
Grapes and raisins are the most unpredictable. Some dogs eat several with no effect and others develop kidney injury from a small handful, which is why every guideline treats any ingestion as worth a call. Raisins hide inside things — hot cross buns, trail mix, oatmeal cookies, fruit loaf.
What to do if your dog ate something toxic
Take it away, work out how much and when, call, and do not wait for symptoms. Signs of poisoning often appear hours after the window when treatment is easiest.
- Remove any remaining food and put the packaging aside.
- Estimate the amount and the time. “Roughly half a bar, twenty minutes ago” is enough.
- Call your vet, an emergency clinic, or a poison helpline.
- Follow their instructions exactly. Never induce vomiting on your own initiative.
- Watch for vomiting, tremors, wobbliness, drooling, collapse or seizures, and go straight in if any appear.
Human foods that are fine in moderation
Plain cooked chicken, plain cooked turkey, carrot, green beans, blueberries, apple without the core, plain pumpkin puree and plain rice are all reasonable. “Plain” is doing the work in that sentence — no butter, no salt, no onion or garlic powder, no seasoning at all.
Keep human food to a small share of daily calories. If you would rather use something purpose-made, our picks for the best dog treats cover training, chewing and sensitive stomachs, and the best dog food for sensitive stomachs is worth a read if table scraps have been causing trouble.
Bringing home a puppy who will eat literally anything? The new puppy checklist covers proofing the house. And if your dog eats things that are not food at all, why does my dog eat poop gets into why. Tremors after an unknown snack are always an emergency — why is my dog shaking explains what to look for.
Frequently asked questions
How much chocolate is dangerous for a dog?
It depends on the type and your dog’s weight — dark and baking chocolate are many times more dangerous than milk chocolate. Do not try to calculate it yourself; give the weight and the wrapper details to a vet or helpline.
Can dogs eat peanut butter?
Yes, as long as it does not contain xylitol or birch sugar. Check the label every time, including on brands you have bought before, since recipes change.
Are cooked bones really that bad?
Yes. Cooking makes bone brittle, so it splinters instead of crushing. That is a different hazard from raw bones and the reason cooked bones show up so often in emergency surgery.
How long after eating something toxic do symptoms appear?
Anywhere from minutes to a couple of days. Xylitol can drop blood sugar within half an hour; grape-related kidney injury may not be obvious for a day or more. Waiting to see is the wrong strategy.
What about garlic in small amounts?
Skip it. The dose that matters varies with the dog, garlic is more concentrated than onion by weight, and there is no benefit worth the uncertainty.
A note on the dog who door-dashes for food
Food-motivated dogs are the ones who slip out of a door on a party day, following a smell. It is the same weekend behaviour that fills shelters after holidays. A collar tag that a stranger can read — or tap — is the difference between a phone call and a search. We make acrylic NFC smart tags with engraved contact details on the back; we are biased about ours, but not about the principle.
Get Your Tag
One tap gets a finder your number — no app for them, no subscription for you.
