Why are macadamia nuts toxic to dogs?

The exact toxin is unknown, but the effect is well documented — dogs develop hind-limb weakness, vomiting, tremors and fever, usually within 12 hours of eating them. Dogs are the only species known to react this way.

How many macadamia nuts will hurt a dog?

Even a small number can cause signs, and sensitivity varies between dogs. There is no established safe amount, so call your vet for any ingestion rather than trying to judge a dose at home.

My dog ate macadamia nuts. Will they be OK?

Usually yes, with treatment. Macadamia poisoning is rarely fatal, and most dogs are back to normal within 24 to 48 hours with veterinary supportive care. Still call your vet — vomiting, tremors and fever need managing.

What about macadamia cookies or nut mixes?

Worse, not better. White-chocolate macadamia cookies add chocolate's toxins and sugar, and nut mixes may include raisins. Bring the packaging when you call the vet so they can assess everything involved.

Can Dogs Eat Macadamia Nuts? Vet-Sourced Answer

Can Dogs Eat Macadamia Nuts?

Toxic to dogs

No. Macadamia nuts are toxic to dogs, causing weakness in the back legs, vomiting, tremors and fever — even in small amounts.

Quick facts

Quick facts
Verdict	Toxic
Risky amount	No safe or toxic dose is established — treat any amount as a risk.
Key symptoms	Weakness, especially in the hind legs, Vomiting, Tremors, Fever (elevated body temperature), Lethargy or depression
What to do	If your dog ate macadamia nuts, call your vet — especially if they were chocolate-coated, which adds a second toxin. Most dogs recover with prompt supportive care.

Why macadamia nuts are toxic to dogs

Macadamia nuts are a genuine oddity in veterinary toxicology: dogs are the only species known to be poisoned by them, and the toxin itself has never been identified. What is well documented is the effect — weakness that often shows up dramatically in the back legs, vomiting, tremors, fever and lethargy, typically within 12 hours of ingestion.

On top of the toxicity, macadamias are among the fattiest nuts there are, so a big raid can also upset the gut or stress the pancreas.

Watch the packaging, not just the nuts

Many cases start with baked goods: white-chocolate macadamia cookies pair the mystery toxin with chocolate, and party nut bowls or trail mix can add raisins to the problem. When you call the vet, list everything the snack contained.

What to do if your dog ate macadamias

Call your vet with your dog’s weight and an estimate of how many nuts went missing. Recent ingestions may be handled with induced vomiting and activated charcoal; beyond that, treatment is supportive — fluids, anti-nausea medication and keeping the dog comfortable. The good news: macadamia poisoning is very rarely fatal, and most dogs recover fully within about 48 hours.

If your dog ate it

If your dog ate macadamia nuts, call your vet — especially if they were chocolate-coated, which adds a second toxin. Most dogs recover with prompt supportive care.

In the US you can also call the ASPCA Animal Poison Control Center at (888) 426-4435 (a consultation fee may apply).

Frequently asked questions

Why are macadamia nuts toxic to dogs?: The exact toxin is unknown, but the effect is well documented — dogs develop hind-limb weakness, vomiting, tremors and fever, usually within 12 hours of eating them. Dogs are the only species known to react this way.
How many macadamia nuts will hurt a dog?: Even a small number can cause signs, and sensitivity varies between dogs. There is no established safe amount, so call your vet for any ingestion rather than trying to judge a dose at home.
My dog ate macadamia nuts. Will they be OK?: Usually yes, with treatment. Macadamia poisoning is rarely fatal, and most dogs are back to normal within 24 to 48 hours with veterinary supportive care. Still call your vet — vomiting, tremors and fever need managing.
What about macadamia cookies or nut mixes?: Worse, not better. White-chocolate macadamia cookies add chocolate's toxins and sugar, and nut mixes may include raisins. Bring the packaging when you call the vet so they can assess everything involved.