Queensland Nut Toxic?

Updated 2026-03-06| 3 min read| 1,012 found this helpful

Macadamia nuts are moderately toxic to dogs even in small quantities, including edible raw varieties.

Toxicity risk for cats, horses, and humans is unconfirmed, with no reported severe non-canine poisoning cases.

Most dogs recover fully spontaneously within 24 to 48 hours of exposure with basic symptomatic care.

FAQ

Is Queensland Nut toxic to Humans?

Low risk; raw non-edible varieties contain cyanogenic glycosides that are removed by parboiling, no recorded severe human poisoning from properly prepared nuts. (Low)

Is Queensland Nut toxic to Cats?

Toxicity unconfirmed, no reported clinical signs of poisoning from macadamia ingestion. (Unknown)

Is Queensland Nut toxic to Dogs?

Depression, rear limb weakness, vomiting, tremors, ataxia, hyperthermia (up to 40.5°C), abdominal pain, lameness, stiffness, pale mucous membranes, elevated blood lipase, triglycerides and alkaline phosphatase levels. (Moderate)

Is Queensland Nut toxic to Horses?

Toxicity unconfirmed, no reported clinical signs of poisoning from macadamia ingestion. (Unknown)

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Toxicity Details

Humans

Low

Low risk; raw non-edible varieties contain cyanogenic glycosides that are removed by parboiling, no recorded severe human poisoning from properly prepared nuts.

Cats

Unknown

Toxicity unconfirmed, no reported clinical signs of poisoning from macadamia ingestion.

Dogs

Moderate

Horses

Unknown

Toxicity unconfirmed, no reported clinical signs of poisoning from macadamia ingestion.

Toxicity Snapshot

Toxic PartsEdible nuts (only confirmed toxic to dogs; raw non-edible varieties contain cyanogenic glycosides removable via parboiling)

Exposure RouteIngestion of raw, cooked, or processed macadamia nut products

Toxic CompoundsCyanogenic glycosides (present only in raw non-edible varieties, neutralized by parboiling); Unidentified toxic agent (present in all varieties, responsible for dog poisoning)

First Aid & Prevention

First 30 Minutes

• Induce vomiting only if ingestion occurred within 2 hours and the dog is conscious, not seizuring, and showing no neurological symptoms.
• Remove all remaining macadamia nut products from the environment to prevent further consumption.
• Collect any leftover nut pieces or product packaging to share with your veterinarian for reference.

Contact Vet Immediately

• Your dog has ingested any quantity of macadamia nuts, regardless of initial symptoms.
• Your dog develops weakness, tremors, vomiting, or elevated temperature after possible exposure.
• Symptoms persist for more than 12 hours after confirmed ingestion.

Prevention

• Store all macadamia nut products (including baked goods containing nuts) out of reach of dogs.
• Never intentionally feed macadamia nuts to dogs, even as an occasional treat.
• Fence off areas under macadamia trees to prevent dogs from accessing fallen nuts unsupervised.

Treatment & Prognosis

• Administer activated charcoal to reduce absorption of unknown toxic compounds if ingestion was recent.
• Provide supportive care including IV fluids, temperature regulation, and pain management for abdominal discomfort as needed.
• Monitor serum biochemistry values to track recovery of liver and metabolic function.

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Professional Toxicology

Scientific NameMacadamia integrifolia

AliasesMacadamia Nut、Australia Nut

Toxicity Grade

HumansLow

CatsUnknown

DogsModerate

HorsesUnknown

Target Organs

Musculoskeletal systemGastrointestinal tractNervous systemLiver

Mechanism of Action

• Exact mechanism of dog poisoning is currently unknown; cyanogenic glycosides in unprocessed non-edible varieties release cyanide when ingested without parboiling.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Dog: Moderate poisoning risk; symptoms appear within 12 hours of ingestion, full spontaneous recovery is expected within 24-48 hours with supportive care.

Cat: No confirmed toxicity; no reported cases of macadamia nut poisoning in cats to date.

Horse: No confirmed toxicity; no reported cases of macadamia nut poisoning in horses to date.

Confusion Risk

The following plants look similar and may be confused:

Other Macadamia species Macadamia tetraphylla (and other genus members)

All Macadamia species carry identical toxicity risk for dogs, with no easily visible visual differences between edible and non-edible varieties for non-experts.

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Related Toxic Plants

Silky Oak

Grevillea robusta

Low toxicity; causes contact dermatitis in humans and mild gastrointestinal upset if ingested by pets.

Coastal Banksia

Banksia integrifolia

Low toxicity; ingestion of foliage or seed pods causes vomiting and diarrhea in dogs and cats.

King Protea

Protea cynaroides

Low toxicity; ingestion of large quantities causes mild gastrointestinal irritation in companion animals.

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Data Sources

1. ASPCA Animal Poison Control

2. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.