Can cats eat Macadamia nuts?
No. Macadamia nuts are a documented toxic food in dogs. Evidence in cats is less extensive, but most veterinary advice is to avoid them entirely.
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Content compiled with reference to guidance from the Blue Cross, PDSA, Royal Veterinary College (RVC), Battersea, and Animal PoisonLine. This site does not provide veterinary advice — always consult a vet. Last reviewed: 27 September 2026.
Key facts
- Verdict: No — dangerous to cats. Macadamia nuts should never be given deliberately.
- Category: Nuts
- Onset: Signs can start 3–12 hours — see the full timeline below.
- If it's already happened: Call your vet now, or the Animal PoisonLine on 01202 509000 (24/7, charges apply) — see the emergency steps below.
If your cat has just eaten macadamia nuts
- Move your cat away from any remaining macadamia nuts. Do not try to make them vomit at home — this is dangerous in cats and rarely works.
- Note how much was eaten and when, and keep the packaging or a photo of the plant/substance if you can.
- Call your vet immediately, even out of hours. Tell them your cat's weight, what they ate, and when.
- If you can't reach your vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7 for guidance. They can advise on urgency and route you to emergency care.
What's the full picture?
Macadamia toxicity is well-documented in dogs, causing weakness, hyperthermia, tremors, and vomiting. In cats the literature is much thinner, but the cautious veterinary position is that macadamias should not be fed to cats.
Beyond the specific toxic concern, macadamias are also very high in fat — enough to trigger vomiting, diarrhoea, or pancreatitis in a cat that eats several.
Macadamia nuts appear in fancy biscuits, cookies, trail mix, and premium chocolate — often combined with chocolate, which compounds the risk.
Symptoms to watch for
Hidden sources you might not think of
- Premium biscuits and cookies
- Trail mix and snack bars
- White or milk chocolate-coated nut selections
Safer alternatives
- Freeze-dried meat treats
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Cat owner essentials
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Questions owners ask
My cat ate one macadamia nut from a biscuit. Should I worry?
Call your vet. One nut is low-risk but a vet can advise on monitoring and any signs to watch for.
Why is the evidence weaker in cats than in dogs for macadamia toxicity?
Macadamia toxicosis has been extensively studied in dogs because it's a very common and well-recognised poisoning there, but there simply haven't been the same number of documented feline cases — cats may be less inclined to eat nuts in the first place. The lack of cases doesn't mean cats are safe from it, just that the syndrome is less well characterised.
What does macadamia toxicity look like in dogs, and could cats show the same?
In dogs, typical signs are weakness (especially in the back legs), a raised temperature, tremors, and vomiting, usually appearing within 12 hours and resolving within 48 with supportive care. Cats haven't been as well studied, but if similar signs appear after macadamia exposure, they should be treated with the same urgency.
Are salted or roasted macadamia nuts worse than raw ones?
The added salt and oil in roasted or salted nuts adds extra risk on top of the macadamia and fat concern — salt toxicity and pancreatitis are both compounded. Treat any form of macadamia nut, however prepared, as something to keep away from your cat.
A cat water fountain encourages drinking, which supports the kidneys — worthwhile for any cat that's had a dietary scare.
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Related
Sources referenced for this guidance
- Veterinary Poisons Information Service (VPIS) — UK clinical toxicology reference used by vets
- International Cat Care — feline-specific clinical guidance
- BSAVA — British Small Animal Veterinary Association reference materials
- Merck Veterinary Manual — professional veterinary reference
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team