Can dogs eat macadamia nuts? No. Macadamia nuts are toxic to dogs, and even a small handful can cause weakness, wobbly back legs, vomiting, tremors and fever. Most dogs recover within a few days with care, but the risk goes up when the nuts come in chocolate, cookies or trail mix. If your dog just ate macadamia nuts, call your vet or a pet poison line now. Below: why they’re toxic, how much is too much, and what treatment looks like.
Avoid. Macadamia nuts are toxic to dogs. Never share them, in any form. If your dog ate any, especially a small dog or nuts mixed with chocolate or raisins, call your vet or the ASPCA Animal Poison Control Center, even before signs appear.
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Why Are Macadamia Nuts Toxic to Dogs?
Here’s the strange part: nobody knows exactly why. The Merck Veterinary Manual states that the toxic mechanism is not known, but the effect in dogs is well documented. Raw and roasted nuts both cause problems.
The ASPCA lists macadamia nuts among the people foods to keep away from pets, noting that signs usually appear within 12 hours, with recovery expected within 24 to 72 hours. On top of the toxin, macadamias are about 76% fat, so they can also cause stomach upset or pancreatitis, and whole nuts can cause a blockage in small dogs.
How Many Macadamia Nuts Are Dangerous?
Merck reports that dogs have shown signs after eating as little as 2.4 grams of macadamia nuts per kilogram of body weight. A single shelled macadamia weighs roughly 2 to 3 grams. That gives a rough idea of how few nuts it can take:
| Dog Weight | Lowest Amount Linked to Signs | About How Many Nuts |
|---|---|---|
| 10 lb (4.5 kg) | ~11 g | 4–5 nuts |
| 25 lb (11 kg) | ~27 g | 10–12 nuts |
| 50 lb (23 kg) | ~55 g | 20–25 nuts |
| 75 lb (34 kg) | ~82 g | 30–35 nuts |
Our estimates based on Merck’s 2.4 g/kg figure and an average nut weight of about 2.5 g. This is not a “safe” limit: some dogs may react to less, and chocolate or raisins in the same snack add separate risks. Call your vet whenever your dog eats macadamias.
Signs of Macadamia Nut Poisoning
Signs usually start within 12 hours of eating the nuts. Common ones include:
- Weakness, especially in the back legs, often the most noticeable sign. Some dogs can’t stand.
- Wobbly walking or stiffness.
- Vomiting and loss of appetite.
- Tremors and shaking.
- Fever (high body temperature).
- Lethargy or seeming depressed.
- Joint or muscle pain; some dogs cry when touched.
These signs can look frightening, especially the leg weakness, but most dogs improve within a day or two and recover fully with supportive care.
How Vets Treat Macadamia Nut Toxicity
There’s no antidote, so treatment focuses on limiting absorption and keeping your dog comfortable while the effects wear off. Depending on timing and signs, your vet may:
- Induce vomiting if the nuts were eaten recently.
- Give activated charcoal to bind what’s left in the gut.
- Provide IV fluids, cooling for fever, and pain relief.
- Monitor your dog, sometimes overnight, until they can walk normally.
The outlook is usually good. Merck notes that dogs given large experimental doses were back to normal within 48 hours even without treatment, but don’t take that as a reason to wait. Mixed snacks with chocolate or raisins can be far more serious.
Macadamia Foods That Hide Extra Dangers
| Food | Extra Risk |
|---|---|
| White chocolate macadamia cookies | Sugar, butter; some recipes use milk or dark chocolate |
| Chocolate-covered macadamias | Chocolate poisoning on top of nut toxicity |
| Trail mix and holiday nut tins | Raisins, chocolate, salt and other nuts |
| Macadamia nut butter or spreads | Concentrated nut; some contain sweeteners |
| Granola bars and baked goods | Hidden nuts, sugar, sometimes xylitol |
If the snack contained chocolate, read our chocolate guide. If it contained raisins, see grapes and raisins, and if it was sugar-free, our xylitol poisoning guide.
Keeping Macadamias Away From Your Dog
- Store nuts and cookie tins in closed cupboards, especially during the holidays.
- Ask guests to keep bags and snack bowls off low tables.
- If you have a macadamia tree, pick up fallen nuts daily.
- Offer safe crunchy snacks instead, like carrots or plain green beans.
Is hind-leg weakness the most common sign? Yes, weakness, often in the back legs, is typical, along with vomiting, tremors and fever, usually within 12 hours.
What's the usual outlook with treatment? Good. Most dogs recover within 24 to 72 hours.
— Dr. Sarah Miller, DVM
Macadamia Nuts and Dogs: Quick Safety Guide
✕ Risky
- Plain or roasted macadamia nuts
- White chocolate macadamia cookies
- Chocolate-covered macadamias
- Trail mix and holiday nut tins
✓ Better swaps
- Carrot sticks
- Plain green beans
- Xylitol-free peanut butter treats
- Plain apple slices
If your dog ate macadamia nuts, call your vet or a pet poison line right away, even if your dog seems fine.
Frequently Asked Questions
Can one macadamia nut hurt a dog?
One nut is unlikely to cause serious problems in a large dog, but it can affect a very small dog. Call your vet to be safe.
How long does macadamia nut poisoning last?
Most dogs improve within 24 to 48 hours and recover fully within about three days with care.
Are macadamia nuts toxic to dogs even when roasted?
Yes. Raw, roasted, salted or chocolate-covered macadamias are all toxic.
Can dogs eat macadamia nuts in cookies?
No. Baking doesn’t remove the toxin, and cookies add sugar, butter and often chocolate.
Can macadamia nut poisoning kill a dog?
Deaths are very rare with macadamias alone. The bigger danger comes when they’re mixed with chocolate, raisins or xylitol.
Are macadamia nuts toxic to cats?
Most reports involve dogs, but nuts are not a good food for cats either. Call your vet if your cat eats them.
What other nuts are bad for dogs?
Black walnuts (especially moldy ones) are dangerous, and pecans, almonds and pistachios aren’t recommended. Plain peanuts are among the safer choices.
Checking another food? See our What Can Dogs Eat? A-Z list of safe and unsafe foods.
The Bottom Line
Can dogs eat macadamia nuts? No. They’re toxic to dogs and can cause weakness, tremors, vomiting and fever within 12 hours, even in fairly small amounts. Most dogs recover with care, but don’t wait: call your vet or a poison line as soon as you know your dog ate any, and check the snack for chocolate, raisins or xylitol. Find more answers in our Can Dogs Eat? guides. This article is general information, not veterinary advice; see our Veterinary Disclaimer.
References & Sources
Written by CPD Nutrition Desk using the sources below. We are not affiliated with these organizations, and this guide is not a substitute for advice from your veterinarian.
- Merck Veterinary Manual — Macadamia nut toxicosis in dogs
- ASPCA — People foods avoid feeding your pets
- ASPCA — ASPCA Animal Poison Control Center