How many macadamia nuts are toxic to a dog?

Even a small number can cause symptoms, and there isn't a safe amount to give deliberately. Unlike some foods where a tiny amount is tolerated, macadamia nuts should be avoided entirely.

What are the signs of macadamia poisoning in dogs?

Weakness, particularly in the back legs, vomiting, tremors, a raised temperature and lethargy are the commonly reported signs, usually appearing within twelve hours of eating them. Contact your vet if you suspect your dog has eaten any.

Are macadamia nuts fatal to dogs?

Most dogs recover fully with prompt veterinary treatment, and fatalities are rare, but it's still a genuine toxicity that needs urgent attention rather than being left to pass on its own.

Can dogs eat other types of nuts?

Some nuts, like plain peanuts in small amounts, are generally considered lower risk, though nuts in general aren't an ideal treat due to fat content. Macadamia and walnuts are specific risks to avoid entirely — check with your vet if you're unsure about a particular type.

Can dogs eat macadamia nuts?

No, dogs must never eat macadamia nuts, and this applies to every dog breed and size. They're genuinely toxic to dogs, even in fairly small amounts, and can cause weakness, vomiting, tremors and a raised temperature — if your dog has eaten any, contact your vet straight away.

Why macadamia nuts are dangerous for dogs

Macadamia nuts contain a compound that's toxic to dogs specifically, even though the exact mechanism isn't fully understood. Unlike some foods where the risk is about quantity, even a small number of macadamia nuts can cause a reaction in a dog, and the toxicity isn't linked to body size the way some other risks are.

Symptoms typically appear within twelve hours of eating them and can include weakness, particularly in the back legs, vomiting, tremors, a raised temperature and lethargy. Most dogs recover with veterinary treatment, but it's genuinely unpleasant for the dog and needs prompt attention rather than being watched at home.

What to do if your dog eats macadamia nuts

Contact your vet immediately, even if your dog seems fine at first — symptoms can take several hours to appear, and your vet may want to see your dog or advise on what to watch for based on how much was eaten.

Try to establish roughly how many nuts were eaten and when, since this helps your vet assess the situation. Don't try to make your dog vomit at home without veterinary guidance, as this isn't always the right approach depending on the situation.

Where macadamia nuts commonly turn up

Beyond nuts sold whole, macadamia can appear in biscuits, cakes, chocolate bars and some Australian-style baked goods, which is worth knowing since a dog getting into a packet of biscuits containing macadamia carries broadly the same risk as eating the nuts directly on their own.

Keep any foods containing macadamia well out of reach, the same as you would with chocolate or grapes, rather than assuming a small baked amount is automatically safe just because it's mixed into something else.

Keeping treats out of reach in future

A lidded bin in the kitchen, kept somewhere a dog can't reach or tip over, and storing snack cupboards securely up high are simple, practical ways to reduce the chance of an accidental ingestion happening again in the future.

If your dog is generally food-motivated and prone to counter-surfing, a puzzle feeder or slow feeder can help redirect that food-seeking behaviour towards something safe and mentally engaging instead of raiding the worktop.

Telling guests and visitors about foods to avoid

A well-meaning visitor sharing a biscuit or a nut from a bowl of party snacks is a common way dogs end up eating something they shouldn't, since a guest usually has no idea macadamia is a risk at all. A quick word before food comes out is worth more than any amount of after-the-fact vigilance.

This matters especially around gatherings and holidays, when bowls of mixed nuts and baked goods are more likely to be left within reach of a dog who is used to being fairly free around the house, particularly once the room fills up and nobody is watching the coffee table closely.

Make treat time better

Things we stock that owners commonly reach for here. Nothing on this page depends on you buying one.

Inflatable Herding Ball with Handles for Dogs

A large, tough inflatable herding ball that taps into your dog's natural chase-and-nudge instinct. Reinforced bite-resistant fabric and grab handles make it great for active outdoor play with medium and large breeds.

£29.99

Chicken-Wrapped Milk Stick Dog Treats

Chewy dog treats of soft milk sticks wrapped in real chicken for tasty, protein-rich rewarding.

From£12.99

Plush Strawberry Snuffle Mat

An interactive foraging mat with removable plush strawberries that hide treats and kibble. Encourages natural snuffling and slows feeding, providing mental enrichment for dogs, rabbits and guinea pigs alike.

From£13.99

Plush Snuffle Foraging Mat

A roll-up plush snuffle mat with cute animal designs. Hide treats in the folds and let your pet sniff and forage to find them - a rewarding enrichment game that beats boredom and slows feeding.

£13.99

Browse all of Can dogs eat… →

Common questions

How many macadamia nuts are toxic to a dog?: Even a small number can cause symptoms, and there isn't a safe amount to give deliberately. Unlike some foods where a tiny amount is tolerated, macadamia nuts should be avoided entirely.
What are the signs of macadamia poisoning in dogs?: Weakness, particularly in the back legs, vomiting, tremors, a raised temperature and lethargy are the commonly reported signs, usually appearing within twelve hours of eating them. Contact your vet if you suspect your dog has eaten any.
Are macadamia nuts fatal to dogs?: Most dogs recover fully with prompt veterinary treatment, and fatalities are rare, but it's still a genuine toxicity that needs urgent attention rather than being left to pass on its own.
Can dogs eat other types of nuts?: Some nuts, like plain peanuts in small amounts, are generally considered lower risk, though nuts in general aren't an ideal treat due to fat content. Macadamia and walnuts are specific risks to avoid entirely — check with your vet if you're unsure about a particular type.

Sources

Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.

Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.