Article reviewed & approved by Dr Alexandra Swan, BVetBiol/BVSc(Hons) BEquineSc MANZCVS(Emergency & Critical Care). She is the Emergency Clinician Lead veterinarian SASH Prospect (Western Sydney).
Macadamia Nut Toxicity in Dogs: Symptoms, Treatment and Prevention
It can be worrying when your pet eats something they shouldn’t. Macadamia nuts are toxic to dogs, and even a small amount can cause sudden weakness, wobbliness and illness. This guide explains why macadamias are dangerous, what symptoms to look for, how much can cause harm, and what to do next.
Are macadamia nuts toxic to dogs?
Yes. Macadamias are poisonous to dogs. Eating these nuts can cause signs such as hind limb weakness, vomiting, tremors and fever. Because the severity varies between dogs, contact your local vet or SASH Emergency straight away if you think your dog has eaten macadamias.
Why are macadamias toxic to dogs?
The exact toxin is still unknown. Macadamias can affect the nervous system and may interfere with muscle control and body temperature. Even after only eating a few nuts, affected dogs may show weakness, shaking or difficulty walking.
How much macadamia is toxic?
Toxicity has been reported at doses as low as about 2 grams per kilogram of body weight. Sensitivity differs between dogs, so any amount should be treated seriously. If you are unsure about how many has been eaten its best to see a vet regardless.
| Dog’s weight (kg) | Estimated toxic dose (g) | Approx. number of nuts* |
| 2 | 4.4 | 1–2 |
| 5 | 11 | 3–5 |
| 10 | 22 | 6–10 |
| 15 | 33 | 10–15 |
| 20 | 44 | 12–18 |
| 25 | 55 | 15–20 |
| 30 | 66 | 18–25 |
*Macadamia nuts vary in size. An average nut weighs around 2.2 grams. Puppies, small breeds, older dogs or those with existing health conditions may be at higher risk.
Symptoms of macadamia toxicity
Signs can appear suddenly and range from mild to severe. Watch for:
- Vomiting or diarrhoea
- Weakness or lethargy
- Hind limb weakness or reluctance to walk
- Tremors or shaking
- Fever (raised body temperature)
- Wobbliness or unsteady movement
- Depression or reduced responsiveness
How soon do symptoms appear?
Most dogs show signs within 3 to 12 hours of eating macadamias, though symptoms can take longer. If your dog has eaten macadamias or food containing them, do not wait for symptoms to appear. Early veterinary advice and treatment can prevent complications.
What to do if your dog eats macadamias
- Contact your local vet or SASH Emergency immediately.
- Provide your dog’s weight, what was eaten (nuts, biscuits, chocolate-coated macadamias), and roughly how much.
- Do not induce vomiting unless directed by a vet. Many at-home items that can be used to make dogs vomit are unsafe and usually do not work. This will delay appropriate care and also can cause more harm.
- Chocolate covered macadamias also adds concerns regarding chocolate toxicity and needs to be seem promptly
- Follow veterinary instructions quickly. Treatments such as induced vomiting at a vet hospital or activated charcoal work best soon after ingestion (within a few hours)
- If your dog hasnt eaten anything else, you should try to encourage them to eat some food as you head to the vet hospital as this can help to slow absorbtion and assist with retrieving the nuts in vomit once the vet has induced vomiting.
- Keep any packaging or leftovers to help your vet identify ingredients and plan treatment.
Treatment of macadamia poisoning
Your vet will tailor care to your dog’s needs. Treatment may include:
- Induced vomiting (if recent and safe to do)
- Activated charcoal to limit toxin absorption
- Intravenous fluids to maintain hydration and support recovery
- Medication for tremors, pain, nausea or temperature control
- Monitoring and nursing care until symptoms improve
Recovery and outlook
Most dogs recover within 24 to 48 hours with prompt treatment. Recovery may take longer if a large number of nuts were eaten or if other toxic ingredients like chocolate or xylitol were involved. Always seek follow-up care if your dog’s symptoms persist or worsen.
How to prevent macadamia poisoning
- Keep nuts and foods containing macadamias well out of reach
- Remind family and guests that macadamias are toxic to dogs
- Be cautious with dropped food during parties or picnics
- Check labels on biscuits, muesli, desserts, nut butters and snack mixes
Common foods that may contain macadamias
- Cookies and slices (especially white chocolate–macadamia)
- Chocolates and confectionery
- Cakes, muffins, muesli and granola
- Nut and trail mixes
- Nut butters and spreads
- Ice-cream and dessert toppings
Can dogs eat any nuts safely?
While some nuts like peanuts or cashews are less toxic, they can still cause problems such as choking, salt overload or pancreatitis. The safest option is to avoid all nuts and stick with dog-safe treats recommended by your vet.
Worried about your dog? We’re here to help
If your dog has eaten macadamias or you’re unsure, contact your local vet or SASH Emergency straight away. Quick action can make all the difference and help your pet feel better sooner.
At SASH, we combine pioneering facilities with a team-based, specialist approach, working together with you and your primary vet to help pets live their best life.
Important: This article provides general information only and should not replace professional veterinary advice. If you are worried about your dog, contact your vet or your nearest emergency hospital.
