Can Dogs Eat Macadamia nuts? No — macadamias are toxic

Q: Can dogs eat macadamia nuts?

No. Macadamia nuts cause a distinctive toxic reaction in dogs — weakness (especially in the hind legs), vomiting, tremors, and fever — at doses as low as 2.4 g per kg of body weight. The mechanism is still unknown.

The full picture

Macadamia nuts are one of a small number of foods that are uniquely toxic to dogs — cats and humans aren't affected, and the exact mechanism of action is still unknown despite decades of research. What's consistent is the clinical picture: weakness (particularly in the back legs), vomiting, muscle tremors, high temperature, and lethargy, typically appearing within 3–12 hours of eating the nuts. The threshold for clinical signs is roughly 2.4 grams per kg of body weight. Since a single macadamia nut weighs around 2 g, that means a 10 kg dog needs to eat just 10–12 nuts to show symptoms. The good news: macadamia toxicity is rarely fatal, and most dogs recover within 24–48 hours with supportive care. The bad news: chocolate-covered macadamias (common in confectionery) combine two separate toxins and can be significantly worse.

If your dog has already eaten macadamia nuts

{'severity': 'urgent', 'steps': ['Call your vet if your dog has eaten any macadamia nuts — even a few can cause symptoms in small dogs', 'If your vet is closed, call the Animal PoisonLine on 01202 509000', 'If the nuts were chocolate-covered, this is more serious — tell the vet about both components', 'Do NOT induce vomiting yourself unless your vet specifically tells you to', 'Note: most dogs recover fully within 48 hours with supportive care, but treatment decisions depend on the dose'], 'vet_info_checklist': ['Approximate number of nuts eaten', 'Whether nuts were plain or coated (chocolate, yoghurt, honey-roast)', 'Time of ingestion', "Your dog's weight", 'Any symptoms appearing yet', 'Whether any other toxic foods were eaten at the same time']}

Risks to watch for

Hind leg weakness or inability to stand (classic sign)
Vomiting, often within 6 hours
Muscle tremors
Raised body temperature (up to 40.5°C)
Depression and lethargy
Pancreatitis from high fat content (uncommon but possible)
Compounded toxicity if paired with chocolate or raisins

Safe portion size

None — macadamias are one of the few foods that are specifically toxic to dogs.

Safer alternatives

Plain unsalted peanuts (xylitol-free)
Blueberries
Small carrot pieces

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Common questions

Will my dog die from macadamia nuts?

Fatalities are rare. Virtually all known cases where macadamias were the only toxin ingested resulted in full recovery within 48 hours. Most treatment is supportive — fluids, anti-fever medication, rest. The exception is chocolate-covered macadamias or co-ingestion with raisins, which can be more dangerous.

How many macadamias are dangerous?

The clinical threshold is about 2.4 g per kg of body weight — roughly one nut per kilo for a small dog. A 10 kg dog could show symptoms on 10–12 nuts. Always err on the side of caution: call your vet even if only a few were eaten.

My dog ate macadamias but seems fine — am I in the clear?

Symptoms can take up to 12 hours to appear. Monitor closely for the next day, watching for hind leg weakness, vomiting, or lethargy. Call your vet if anything develops.

What about other tree nuts — almonds, cashews, pistachios?

Only macadamias cause this specific toxic syndrome. Other nuts aren't chemically toxic but most are too fatty, too salty, or too hard to digest to be good for dogs. See our pages on almonds, walnuts, and pecans for specifics.

Why don't humans or cats get this?

Nobody knows — the toxic mechanism hasn't been identified. It's species-specific to dogs. This makes macadamia poisoning one of the more puzzling cases in veterinary toxicology.

Important: This page is general information, not veterinary advice. Every dog is different, and individual factors (age, breed, health conditions, medications) can change what's safe. If in doubt, always contact your vet — or the Animal PoisonLine on 01202 509000 in the UK.