Macadamia Nuts and Dogs: A Toxin That Targets the Legs

A dog that has eaten macadamia nuts often looks like it has forgotten how its back legs work. It is alarming to watch, and usually recoverable.

It is one of the strangest things you can watch happen to a dog. Within a few hours of getting into a bag of macadamia nuts, the back end simply stops cooperating. The legs go weak and wobbly, the dog struggles to stand, and it looks for all the world like something catastrophic has happened to its spine.

Usually it has not. Macadamia poisoning looks far worse than it generally turns out to be, and most dogs are back to normal in one to three days with supportive care. But it needs a phone call, and there is a reason it needs one urgently.

What the nuts do

Nobody has fully worked out the mechanism, which is unusual for something this well documented. What is clear is that macadamias are specifically toxic to dogs, and not to most other animals we keep.

Signs usually turn up within twelve hours. The hallmark is that hind-leg weakness, often alongside a wobbly walk, low mood, vomiting, tremors and a raised temperature.

The real reason to ring

Here is the part that matters more than the nuts themselves. Macadamias almost never turn up on their own.

They come in cookies. They come in trail mix. Most of all, they come coated in chocolate, and chocolate is a serious poison in its own right. A dog that has eaten chocolate-covered macadamias has taken two toxins in one mouthful, and a fancy biscuit can add raisins or xylitol on top of that.

So when you ring, the useful question is not just how many nuts, but what the nuts were in. Read the ingredients rather than naming the packet.

What to do

1. Ring your vet or a poison line, and tell them exactly what the nuts were combined with.
2. Keep the packaging so every ingredient can be checked.
3. Watch the back legs over the next twelve hours.

In the US, the ASPCA Animal Poison Control Center or the Pet Poison Helpline. In the UK, the Animal PoisonLine.

Do not try to make your dog sick unless a vet has told you to, and do not assume a handful is fine because your dog is big. For a small dog especially, a few nuts is not nothing.

What you might see

• Weakness, worst in the hind legs
• A wobbly, unsteady walk
• Low mood and lethargy
• Vomiting
• Tremors
• A dog that feels hot

Australia, Hawaii and the minibar

Macadamias are a souvenir. They fill gift boxes and market stalls in Australia and Hawaii, they turn up in hotel minibar snacks and in expensive biscuits, and the gift-box versions are very often the chocolate-coated kind.

If somebody brings you a hamper, put it somewhere with a door on it before you open the card.

Which is why the ingredients list matters

If the macadamias arrived inside chocolate, the chocolate is very likely the more serious problem and it dictates the treatment. If there were raisins in the same biscuit, that raises a kidney question that the nuts alone do not. If the product was sugar-free, xylitol becomes the priority above everything else.

So the useful thing to bring, or photograph, is the packaging rather than a count of the nuts. It is the difference between a straightforward supportive case and one that needs a completely different plan.

What it looks like while it passes

Expect a dog that is wobbly on its back end, reluctant to get up, and generally sorry for itself, possibly with a mild fever and some trembling. That picture is unpleasant to watch but is the expected course rather than a sign of deterioration.

What is not expected is worsening: collapse, seizures, or a dog that becomes progressively weaker rather than gradually better. Any of that means going back in.

Sources

This article was written using guidance from ASPCA Animal Poison Control Center, a leading 24/7 animal poison control resource in the United States. This guidance is for general information and does not replace a consultation with your own veterinarian. In an emergency, always contact a vet. Read [how we write our health guidance](https://rochsociety.com/how-we-write-our-health-guidance/). Last reviewed July 2026.