By Dial A Vet Veterinary Team
Macadamias are grown widely in Australia and turn up in baking, trail mixes, and festive hampers. Dogs that eat them can develop a distinctive toxicosis: weakness (especially in the hind legs), tremors, vomiting, and sometimes a raised temperature. The syndrome is well recognised even when the exact toxin mechanism is still studied. Macadamias are not a training treat.
Key takeaways
- Macadamia ingestion is linked with weakness, tremors, vomiting, and fever in dogs.
- Chocolate-coated macadamias add theobromine risk on top.
- Call your vet or Animal Poisons Helpline (1300 869 738) with an estimated count.
- Do not induce vomiting with salt or peroxide unless directed.
- Related: toxic nuts overview, chocolate poisoning, signs of poisoning.
What owners usually notice
Within a day of eating macadamias, dogs may look drunk in the back end, reluctant to stand, shaky, or uncomfortable. Vomiting and lethargy are common. Many dogs recover with veterinary supportive care, but you cannot predict severity from the couch. Fatty nuts also stress the pancreas in some patients.
Typical exposures
- Open baking bowls of cookie dough with chopped macadamias
- Christmas gift tins left on low tables
- Trail mix spilled in the car
- "Healthy" muffin tops shared by well-meaning guests
When it is an emergency
Marked weakness, continuous tremors, collapse, or chocolate macadamia mixes eaten in quantity: emergency clinic with the packet.
Immediate steps
Remove remaining nuts. Estimate how many are missing. Note chocolate, xylitol, or raisin companions in the mix. Call 1300 869 738 or your clinic. No DIY emetics unless instructed.
Veterinary care
Supportive care may include decontamination when appropriate, fluids, temperature monitoring, and nursing until strength returns. Your vet decides medicines; this page does not prescribe.
Prevention
Store nuts in latching cupboards. Keep festive tins off coffee tables. Check muffin and cookie recipes before dogs are invited into the kitchen. Remind guests that macadamia "shares" are off limits.
Australian orchard and kitchen context
Whole nuts in shells still tempt chewers and can crack teeth. Shell fragments are not toys. Compost macadamia waste in sealed bins if dogs patrol the yard.
Practical notes for Australian homes
Keep the Animal Poisons Helpline number (1300 869 738) in your phone before you need it. After hours emergency clinics fill quickly on weekends and holidays, so call ahead while you travel when advised. Hot weather makes dehydrated, vomiting pets deteriorate faster; use air-conditioned transport when you can and do not delay because the day feels busy.
Write a short card with your pet's weight, usual diet, and any chronic medicines. Hand it to triage nurses so details are not lost in the rush. Ask what home observations matter most in the first 24 hours after discharge.
If cost is a concern, say so early. Teams can often stage diagnostics while still covering the urgent risks. Avoid stacking random over-the-counter human products into the plan; they muddy the picture and can cause harm.
Extra context for worried owners
Write down a timeline while details are fresh: when the exposure happened, what was left on the floor, and which pets share the house. That scrap of notes helps Helpline staff and triage nurses more than a stressed verbal guess. If multiple pets had access, mention every animal, even the ones that "probably" did not eat anything.
Photograph packaging, plants, or broken objects before you bin them. Clear labels beat memory after a sleepless night. If you are driving to an emergency clinic, call ahead so the team can prepare; say whether your pet is vomiting in the car, seizuring, or having trouble breathing.
Do not crowd the pet with loud voices or forced exercise "to keep them awake" unless a clinician asks for that. Quiet transport, a non-slip surface, and a second person to watch breathing are enough for most trips. Keep a portable bowl of water available only if your vet said drinking is still appropriate.
During recovery at home, follow the feeding and recheck plan you were given. Soft stools for a day can be ordinary after gut stress; repeated vomiting, black stools, pale gums, collapse, or new tremors are reasons to call back the same day. Avoid adding new supplements, bone broths from oniony stock, or leftover human medicines while you wait for the all-clear.
Australian summers make dehydration and heat stress stack onto toxin cases. Park in shade, use air-conditioning if you have it, and do not leave animals in cars while you queue for reception. If bushfire smoke or extreme heat is also in the forecast, say so; clinics may adjust monitoring advice.
FAQ
My dog ate one macadamia. Worry?
Call anyway for small dogs or if more nuts might have been eaten unnoticed.
Are roasted and salted macadamias safer?
No. Salt adds thirst and sodium load; roasting does not remove the problem.
What about macadamia oil alone?
Ask your vet before using any oil as a supplement. Do not assume food oils are risk-free.
How long do weakness signs last?
Often improve over one to two days with care, but follow your clinic's monitoring plan.
Talk with a vet
Nut tin raided? Book a Dial A Vet consult.
References
- Merck Veterinary Manual: Macadamia nut toxicosis
- ASPCA Animal Poison Control: Macadamia nuts
- Animal Poisons Helpline (Australia): 1300 869 738
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.
