Can Dogs Eat Hazelnuts? What Vets Say

The Short Answer

Hazelnuts are not toxic to dogs — but they are also not a treat worth giving.

There is no poison in a hazelnut the way there is in a macadamia nut. The problems are physical and nutritional: the shell is brutally hard, the nut itself is exactly the wrong shape and size to go down a small dog's throat safely, and it is dense with fat their digestive system does not need.

If your dog swiped one off the counter, that is very likely fine. If you were planning to share a handful, use something else.

Why Hazelnuts Are a Problem

Three separate risks stack up here, and none of them involve toxicity.

The shell. The AKC is direct about this one: although these nuts are not toxic, "the shells of hazelnuts are extremely hard and can cause choking and blockages." Hazelnut shells do not crack under a dog's teeth the way they do under a nutcracker. They splinter, or they go down whole.

The size and shape. A shelled hazelnut is a smooth, round, roughly ¾-inch sphere — close to the worst possible geometry for a dog that swallows first and chews later. In a Yorkie or a Dachshund, that is a plausible obstruction. In a Labrador, it usually just passes.

The fat. The AKC notes that tree nuts have a high fat content and "can be too rich for a dog's diet, cause pancreatitis, and contribute to obesity." Hazelnuts are around 60% fat by weight — one of the fattier nuts on the shelf. That is not a problem in a single nut, but it is a real one in a handful.

The mold risk nobody thinks about

If your dog is finding hazelnuts in the yard rather than the pantry, there is a fourth risk. The AKC warns that fallen nuts "may become moist and develop a type of mold that can be toxic to dogs."

That mold matters. Certain species produce aflatoxin, and PetMD states plainly that any nut that has become moldy is toxic to dogs. Damp nuts off the ground are a genuinely worse bet than nuts from a jar.

How Hazelnuts Compare to Other Nuts

Not all nuts sit in the same category, and the distinction is worth knowing.

Macadamia nuts are the one to take seriously. The ASPCA and AKC both class them as genuinely toxic to dogs, causing vomiting, weakness, loss of coordination, and elevated temperature. Our guide to macadamia nuts covers what to do if that happens.

Compared with that, hazelnuts are a much smaller worry — closer to cashews, which are safe in principle but rich enough that a handful causes trouble. Our broader nuts for dogs guide lays out the full ranking.

What to Do If Your Dog Ate Hazelnuts

Work through this in order.

1. Figure out how many, and whether they were shelled. A single shelled nut is a very different situation from six in the shell.
2. Check your dog's size. Under 20 pounds, the obstruction risk is meaningfully higher.
3. Rule out chocolate. If the hazelnuts came coated, or as a spread, the chocolate is now the main problem — call your vet.
4. Do not induce vomiting unless your vet tells you to. Bringing a hard shell back up can do damage on the way.
5. Watch for 24 to 48 hours. Most dogs are entirely fine.

For a large dog who ate one or two plain hazelnuts, monitoring at home is almost always the right call.

Signs of Trouble to Watch For

Two different pictures to keep an eye on.

Choking or obstruction — act immediately:

• Gagging, retching, or repeated swallowing
• Drooling or pawing at the mouth
• Vomiting that keeps coming back, especially without producing much
• Straining to defecate, or no stool for over a day
• A hard, tender, or bloated belly

Digestive upset from fat — usually milder:

• Soft stool or diarrhea
• One-off vomiting
• Gas and gurgling
• Low appetite for a meal

The combination that matters most is repeated vomiting plus a painful abdomen plus refusing food. That is the pancreatitis pattern, and it needs a vet the same day.

When to Call Your Vet

Call right away if your dog is gagging, choking, retching without bringing anything up, or drooling heavily — a lodged shell will not clear on its own.

Call the same day if your dog ate a large quantity, ate nuts in the shell, weighs under 20 pounds, has a history of pancreatitis, or shows repeated vomiting and belly pain. The AKC's advice on nuts is worth repeating: call your vet if your dog gets into a large container of them, because of the pancreatic risk.

Call immediately for anything chocolate-coated, and mention the amount and your dog's weight.

The Bottom Line

• Hazelnuts are not toxic to dogs, unlike macadamia nuts and black walnuts
• Hazelnut shells are extremely hard and can cause choking or blockages
• The high fat content risks digestive upset and, in quantity, pancreatitis
• Small dogs face the most obstruction risk from the nut's round shape
• Nuts found outdoors may carry toxic mold — those are worse than nuts from a jar
• Chocolate hazelnut spreads are a separate, more urgent problem
• There is no nutritional reason to offer hazelnuts, so simply do not

For the wider view on what is worth sharing from your plate, see our guides to toxic foods for dogs and what human food dogs can eat.