These are the human foods that are genuinely dangerous for dogs — the ones to keep off the floor, the counter, and the table entirely. Each links to a full record with the dose context, symptoms, and what to do.
Last verified: July 20, 2026
Most foods a dog begs for are harmless in small amounts. This page is the short list that isn’t. Some of these cause problems only in larger amounts (like salt); others, like grapes and xylitol, can harm a dog in tiny quantities and unpredictably. When in doubt about any of them, don’t wait for symptoms — call. Early treatment is almost always easier and more effective than waiting.
The never-feed list
| Food | Why it’s dangerous |
|---|---|
| Chocolate | Theobromine and caffeine affect the heart and nervous system; darker chocolate is more toxic per ounce. |
| Grapes, raisins & currants | Can cause sudden, unpredictable kidney failure. There is no amount known to be safe. |
| Xylitol (birch sugar) | A sugar substitute in gum, sugar-free foods, and some peanut butters; triggers a blood-sugar crash and liver failure, fast. |
| Onion & garlic | The whole allium family (also leeks, chives, shallots) damages red blood cells — toxic cooked, raw, or powdered. |
| Macadamia nuts | Cause weakness, tremors, vomiting, and overheating, sometimes after only a few nuts. |
| Avocado | Best avoided — the large pit is a choking/blockage risk and the flesh is high in fat. |
| Coffee, tea & caffeine | Caffeine is toxic to dogs; grounds, beans, tea bags, and energy drinks are the concentrated hazards. |
| Alcohol & raw yeast dough | Alcohol poisons dogs quickly; raw dough ferments in the stomach, producing alcohol and painful gas. |
| Excess salt | Large amounts (salty snacks, dough, homemade play dough) can cause dangerous sodium poisoning. |
What to do if your dog ate something toxic
- Call now. Contact your veterinarian or ASPCA Animal Poison Control at (888) 426-4435 right away. Don’t wait for symptoms — with grapes, xylitol, and onion, damage can be underway before a dog looks unwell.
- Have the details ready: your dog’s weight, what it ate, roughly how much, and when.
- Don’t induce vomiting on your own unless a veterinary professional walks you through it — with some substances it does more harm than good.
- Keep the packaging. For chocolate, gum, or a sweetener, the label helps the vet judge the dose.
A note on how we built this list
PuppyPaw is a reference, not a symptom checker or a diagnostic tool. This hub gathers the foods our records rate toxic or avoid into one place so you can scan fast in a hurry. For the full picture on any food — including the ones that are safe — browse the fruits, vegetables, and human-food and snack hubs.