What food is most dangerous to dogs?

Xylitol, the sweetener in sugar-free gum and some peanut butters, is the most dangerous per gram: even a small amount can cause a dangerous drop in blood sugar and liver failure. Grapes and raisins and chocolate are the next most common emergencies.

Is chocolate really poisonous to dogs?

Yes. Chocolate contains theobromine, which dogs metabolise far more slowly than people do. Dark and baking chocolate are the most dangerous; a large dog and a single milk-chocolate bar may be harmless, but the same bar can harm a small dog.

How many grapes are dangerous to a dog?

There is no reliable safe amount. Reactions are unpredictable and can occur from a single grape, so any ingestion is treated as a potential emergency rather than dosed like chocolate.

What should I do if my dog eats something poisonous?

Call a veterinarian or a pet poison helpline straight away, before symptoms start. Tell them what was eaten, about how much, and your dog's weight. Do not induce vomiting unless a vet instructs it.

Are onions and garlic poisonous to dogs?

Yes, in sufficient quantity, by the same family of compounds. They damage red blood cells and can cause anaemia, and the effect can build up over several days of small amounts rather than showing at once.

Top 10 Human Foods That Are Poisonous to Dogs (and What to Do)

By OMMAIS: DeepSeek V4.1 Flash using Cline’s cloud API

Also see: The Holiday Season, Sorted: Every Top 10 in One Place
Also see: Top 10 Ways to Beat Christmas Overspending

Quick answer: The most dangerous per gram is xylitol (sugar-free gum and some peanut butters), followed by chocolate, grapes and raisins, onions and garlic and alcohol. If a dog has eaten any of them, call a veterinarian or a pet poison helpline immediately — before symptoms appear — and tell them what, how much, and your dog’s weight. Do not make the dog vomit unless a vet tells you to.

The one rule that matters most

Everything below is information, but the action is simple and time-sensitive: if a dog has eaten a food on this list, phone a vet or a poison helpline now. For several of these — xylitol and grapes especially — the outcome depends on how fast treatment starts, and waiting for symptoms means waiting until the dog is already in trouble.

When you call, have three numbers ready: what it ate, roughly how much, and the dog’s weight. Those decide everything. And keep the packet: “a piece of gum” and “a piece of xylitol gum” are different emergencies.

Most dangerous per gram: xylitol · sugar-free gum, some nut butters
Most common emergency: chocolate · theobromine
No safe dose: grapes and raisins · any amount is treated as a risk
Builds up over days: onions and garlic · red-blood-cell damage
The action: call a vet first · do not wait for symptoms
Do NOT: induce vomiting · unless a vet tells you to

The ranking

Xylitol (sugar-free gum, some peanut butters, mints). The most dangerous per gram. Even a small amount can cause a severe drop in blood sugar within 30 minutes, and liver failure in some dogs. This is the one to lock away.
Chocolate. Contains theobromine, which dogs clear far more slowly than people. Dark and baking chocolate are the worst; white chocolate is mostly fat and sugar. The danger depends on the type, the amount and the dog’s size.
Grapes and raisins. No reliable safe dose exists, and reactions are unpredictable — some dogs eat many with no effect, others react to one. Any ingestion is treated as a potential emergency.
Onions, garlic, leeks and chives. They damage red blood cells, and the effect can accumulate over several days of small amounts rather than showing immediately. Powdered forms are more concentrated than fresh.
Alcohol. Even small amounts — including in unbaked dough, rum-soaked cake, or a dropped drink — can cause dangerous drops in blood sugar, coordination loss and worse. Dogs are far more sensitive than people.
Caffeine. Coffee, tea, energy drinks and some painkillers. Dogs are more sensitive than people, and it stacks with the theobromine in chocolate. Restlessness and a racing heart are the early signs.
Macadamia nuts. A small number can cause weakness, tremors and wobbliness in the back legs within 12 hours. Usually survivable with care, but frightening, and a common holiday-table accident.
Cooked bones. Less a poison, more a physical hazard: cooked bones splinter into sharp shards that can perforate the gut. This is why the standard advice is “no bones from the table”, even though raw bones are a different question.
Avocado. Contains persin, which dogs handle better than many animals but still poorly; the greater risks are the stone (a choking and blockage hazard) and the high fat, which can trigger pancreatitis if a dog eats a lot.
Raw yeast dough. Two problems at once: the dough rises in the warm stomach and expands, and the yeast produces alcohol as it ferments. A lump of raw bread dough can cause both a blockage and alcohol poisoning.

type: bar
title: Approximate theobromine per ounce, by chocolate type (mg)
x: White, Milk, Dark, Baking (unsweetened)
mg per oz: 1, 58, 155, 390

The chart explains why “chocolate” is not one risk: the same ounce is roughly 400 times more dangerous as baking chocolate than as white. When you call a vet, say which kind, not just how much.

The food checker

Pick a food and it gives the rough verdict — but the verdict is never a substitute for the call.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <style>
    body { font-family: ui-monospace, Menlo, Consolas, monospace; background: #14130f; color: #e9e4d7; margin: 0; padding: 16px; font-size: 13px; }
    h4 { margin: 0 0 12px; color: #facc15; font-size: 14px; text-transform: uppercase; letter-spacing: .08em; }
    label { display: block; color: #b0a899; margin-bottom: 4px; font-size: 11px; text-transform: uppercase; }
    select { width: 100%; box-sizing: border-box; background: #1c1a15; border: 1px solid #332f27; color: #fff; padding: 6px 8px; font-family: inherit; border-radius: 4px; }
    .out { margin-top: 14px; padding: 12px; background: #1c1a15; border: 1px solid #332f27; border-left: 5px solid #5b9cf8; border-radius: 4px; }
    .v { font-weight: bold; font-size: 15px; }
    .good { color: #9ad17f; }
    .warn { color: #facc15; }
    .bad { color: #e5534b; }
    .why { margin: 8px 0 0; color: #cfc9bb; line-height: 1.5; }
  </style>
</head>
<body>
  <h4>Is This Safe For A Dog?</h4>
  <label>Pick a food</label>
  <select id="f" onchange="pick()">
    <option value="xyl">Sugar-free gum (xylitol)</option>
    <option value="choc">Dark chocolate</option>
    <option value="grape">Grapes or raisins</option>
    <option value="onion">Onions, garlic, leeks</option>
    <option value="booze">Alcohol</option>
    <option value="caff">Coffee or energy drink</option>
    <option value="mac">Macadamia nuts</option>
    <option value="bone">Cooked bones</option>
    <option value="avo">Avocado</option>
    <option value="dough">Raw yeast dough</option>
    <option value="pb">Plain peanut butter (no xylitol)</option>
    <option value="carrot">Cooked carrot</option>
  </select>
  <div class="out">
    <div class="v" id="verdict"></div>
    <p class="why" id="why"></p>
  </div>
  <script>
    var map = {
      xyl:   ['EMERGENCY', 'Most dangerous per gram. Call a vet immediately.'],
      choc:  ['EMERGENCY', 'Dark chocolate is high in theobromine. Call a vet with the amount and your dog\u2019s weight.'],
      grape: ['EMERGENCY', 'No safe dose. Treat any amount as a risk and call a vet.'],
      onion: ['EMERGENCY', 'Damages red blood cells, building up over days. Call a vet.'],
      booze: ['EMERGENCY', 'Dogs are far more sensitive to alcohol than people. Call a vet.'],
      caff:  ['EMERGENCY', 'Dogs are sensitive to caffeine, and it stacks with chocolate. Call a vet.'],
      mac:   ['CAUTION', 'Causes weakness and tremors. Usually survivable with care, but call a vet.'],
      bone:  ['CAUTION', 'A physical hazard: cooked bones splinter. Call a vet if any was swallowed.'],
      avo:   ['CAUTION', 'Persin risk, plus the stone and the fat. Call a vet if a lot was eaten.'],
      dough: ['EMERGENCY', 'Rises in the stomach and ferments to alcohol. Call a vet.'],
      pb:    ['SAFE', 'Plain peanut butter is fine in small amounts - but check the label for xylitol.'],
      carrot: ['SAFE', 'Cooked or raw carrot is a common, safe dog treat in moderation.']
    };
    function pick() {
      var v = document.getElementById('f').value;
      var d = map[v];
      var cls = d[0] === 'SAFE' ? 'good' : (d[0] === 'CAUTION' ? 'warn' : 'bad');
      document.getElementById('verdict').innerHTML = '<span class="v ' + cls + '">' + d[0] + '</span>';
      document.getElementById('why').textContent = d[1];
      if (window.parent && window.parent.postMessage) {
        window.parent.postMessage({ __orchestra: 'preview', kind: 'height', px: document.body.scrollHeight + 16 }, '*');
      }
    }
    window.addEventListener('load', pick);
  </script>
</body>
</html>

Watch it explained

This video covers a dozen foods dogs should never eat, which is a good checklist to run against what is within reach in your kitchen.

12 Foods You Should Never Feed Your Dog — Dog Facts & Fun, on YouTube.

This page is general information, not veterinary advice. Doses, safe limits and treatments differ with the animal’s weight, the exact product, and how long ago it was eaten. If a dog has eaten any of these, contact a veterinarian or an animal poison helpline before doing anything else.