Which Halloween candy is dangerous? (danger chart)
Summary of Pet Poison Helpline's Halloween candy danger chart (Pet Poison Helpline):
| Candy or item | Concern | Main risk |
|---|---|---|
| Dark or baking chocolate | High | Theobromine and caffeine |
| Sugar-free candy and gum (xylitol) | High | Low blood sugar, liver failure |
| Raisins, including chocolate-covered | High | Kidney failure |
| Cannabis (THC) edibles and gummies | High | Often mistaken for regular candy |
| Milk chocolate bars | Moderate | Depends on the amount and your dog's size |
| Wrappers and lollipop sticks | Moderate | Bowel obstruction |
| Candy corn, Starburst, gummies, Skittles | Lower | Sugar and fat can cause pancreatitis |
Pet Poison Helpline says its calls go up in Halloween week, with chocolate at the top of the list (Pet Poison Helpline). In ASPCA Animal Poison Control's 2025 data, chocolate made up 13.6% of more than 376,000 exposures, and food and drink (including grapes, raisins and xylitol gums) made up 16.4% (ASPCA).
Chocolate candy: how much is too much?
Chocolate contains theobromine and caffeine (methylxanthines). Merck reports mild signs (vomiting, diarrhea, thirst) from about 20 mg/kg, heart effects at 40–50 mg/kg and seizures at 60 mg/kg or more (Merck). Darker chocolate holds more: about 64 mg per ounce in milk chocolate, 150–160 mg/oz in semisweet and dark, 440 mg/oz in unsweetened baking chocolate and 807 mg/oz in cocoa powder. White chocolate has almost none, about 1.1 mg/oz (Merck).
Estimated bars needed to reach Merck's guideposts. Milk bar = 1.55 oz (44 g) at ~99 mg; dark bar = 1.45 oz (41 g) at ~230 mg (Merck 5.6 mg/g, the cautious end of 5.3–5.6) (Merck). USDA lab values give about the same, 99 mg and 220 mg (USDA).
| Dog weight | 1 milk bar | Milk bars to ~20 mg/kg | 1 dark bar | Dark bars to ~20 mg/kg | Dark bars to ~60 mg/kg |
|---|---|---|---|---|---|
| 5 lb (2.3 kg) | 44 mg/kg | 0.5 | 101 mg/kg | 0.2 | 0.6 |
| 10 lb (4.5 kg) | 22 mg/kg | 0.9 | 51 mg/kg | 0.4 | 1.2 |
| 20 lb (9.1 kg) | 11 mg/kg | 1.8 | 25 mg/kg | 0.8 | 2.4 |
| 40 lb (18 kg) | 5.5 mg/kg | 3.7 | 13 mg/kg | 1.6 | 4.7 |
| 80 lb (36 kg) | 2.7 mg/kg | 7.3 | 6.3 mg/kg | 3.2 | 9.5 |
These are estimates, not safe limits. Real candy varies, and dogs rarely stop at one piece. Fun-size bars are smaller, but weights vary by bag, so check the wrapper. Our chocolate toxicity calculator has a Halloween candy list; it uses the higher of the USDA lab value and a Merck chocolate-type floor, so its estimates lean cautious.
Merck says chocolate signs usually start within 6–12 hours and can last up to 72 hours in severe cases (Merck). Pet Poison Helpline adds that signs may not appear for several hours, so a dog who seems fine may still need care (Pet Poison Helpline). Full guide: dog ate chocolate.
Sugar-free candy, gum and mints (xylitol)
Xylitol is a sweetener in sugar-free gum, mints and "keto," low-sugar or diabetic candy. Pet Poison Helpline says to check labels for "xylitol," "birch sugar," "birch extract" or "wood sugar" (Pet Poison Helpline).
- Dose: Merck links doses above about 100 mg/kg (45 mg/lb) with low blood sugar, and above 500 mg/kg (227 mg/lb) with possible severe liver injury (Merck).
- Speed: Pet Poison Helpline warns low blood sugar can start within 10–15 minutes (Pet Poison Helpline). Merck says signs can start within 30 minutes, or be delayed up to 12–18 hours with some gums (Merck).
- Amounts vary: Pet Poison Helpline notes that xylitol content varies widely, even between flavors of one gum brand (Pet Poison Helpline), so treat any sugar-free candy as an emergency until a vet says otherwise.
See dog ate xylitol, the xylitol calculator and our gum guide.
Raisins and chocolate-covered raisins
Some families hand out mini boxes of raisins. Pet Poison Helpline says there is no known safe amount, and chocolate-covered raisins combine two toxins in one bite (Pet Poison Helpline). Merck reports vomiting or diarrhea usually within 6–12 hours, and kidney failure can develop within 24–72 hours (Merck). See dog ate raisins.
Cannabis edibles that look like candy
THC gummies and chocolates are easy to mistake for regular candy (Pet Poison Helpline). Merck reports mild signs in dogs from THC doses as low as 0.3–0.5 mg/kg, signs usually within 1–2 hours of eating (up to 4 hours on an empty stomach), and recovery usually within 1–3 days; deaths are extremely rare (Merck). Tell your vet if the candy could contain THC, because a chocolate edible means two problems at once. See dog ate marijuana or edibles and dog ate brownies.
Wrappers, foil and lollipop sticks
Dogs don't unwrap candy. Pet Poison Helpline warns that foil, cellophane wrappers and lollipop sticks can cause a life-threatening bowel obstruction that may need surgery. Compare what's left in the bag with what was there: missing wrappers may have been swallowed too. Watch for vomiting, not eating, lethargy, not pooping or straining to poop. X-rays may be needed (Pet Poison Helpline).
"Non-toxic" candy in large amounts
Candy corn, Skittles, Starburst, gummies, caramels and marshmallows aren't poisonous in themselves, but large amounts of sugary, fatty candy can cause pancreatitis, which may not show up for 2–4 days. A lot of gummy candy can also pull fluid into the gut and upset electrolytes (Pet Poison Helpline).
What to do right now
- Move your dog away from the candy and collect every wrapper and bag. Note what was eaten, roughly how much is missing and your dog's weight (Pet Poison Helpline).
- Check labels for xylitol or birch sugar, raisins, THC and macadamia nuts.
- For chocolate, enter the candy and your dog's weight in the chocolate calculator.
- Call your vet, ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661 now, even if your dog seems fine.
- Don't make your dog vomit unless a vet tells you to (Pet Poison Helpline). Merck notes vets consider it only in dogs that still seem normal and ate chocolate recently, for example within 2 hours, using veterinary drugs (Merck).
More numbers and hotlines: dog poison control.