Can dogs eat macadamia nuts?
If your dog has just eaten macadamia nuts
Do this now
- 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
What your vet will want to know
Have this information ready when you call:
- 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
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.
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
Symptom timeline
Symptoms typically progress in stages. Knowing what to expect helps you act fast:
- Within 3–6 hours Vomiting, lethargy, raised temperature
- 6–12 hours Hind leg weakness, wobbling, tremors, joint stiffness
- 12–24 hours Peak symptoms — some dogs unable to stand on back legs
- 24–48 hours Gradual recovery; most dogs back to normal within 48 hours with supportive care
Breed-specific warnings
- Small dogs: hit the 2.4 g/kg threshold on just 3–5 nuts.
- Breeds prone to pancreatitis (miniature schnauzer, Yorkie, cocker spaniel) have extra risk from the high fat content.
- Flat-faced breeds: never induce vomiting at home.
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
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.
Unexpected vet bills can run into thousands
One emergency visit for food poisoning can cost £500–£5,000+. Compare UK pet insurance in 60 seconds.
Compare pet insurance →Checked against UK veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the Animal PoisonLine on 01202 509000.