The exact toxic mechanism of macadamia nuts is not understood even in dogs, the only species in which macadamia nut poisoning has been well documented and clinically recognized. Sources reviewed here state there is not enough research to know how cats are affected, with some describing macadamia toxicosis in cats as currently unrecognized or unestablished. General risks that do apply regardless of species include GI upset from the nut's high fat content and, if the nuts are salted, added sodium.
No dose or established toxic threshold exists for cats specifically, since feline macadamia nut toxicosis has not been documented the way it has for dogs. Because of that uncertainty, macadamia nuts still shouldn't be fed to cats, but the acute neurotoxicity syndrome documented in dogs (tremors, weakness, hyperthermia) is not confirmed to occur in cats the same way.
This isn't established. Macadamia nut poisoning with tremors and weakness is well documented in dogs, but sources say there isn't enough research to know whether cats are affected the same way — dogs are, per some sources, the only species in which this specific poisoning has been recognized. Macadamia nuts still aren't recommended for cats, but the well-known dog syndrome shouldn't be assumed to transfer directly.
Contact a veterinarian for advice. Macadamia nuts are high in fat and can upset the stomach, and the safest approach is to call, particularly if the nuts were salted, roasted, or part of a cookie containing chocolate.
General public resources referenced while researching this tool's topic.
General educational guidance based on the references above, not veterinary advice. See our editorial policy for how we choose sources.
This tool is intended for educational purposes only and should not be used as a substitute for emergency veterinary advice, diagnosis, or treatment.
If your pet may have consumed toxic foods, chocolate, medications, chemicals, or other dangerous substances, seek immediate help from a licensed veterinarian or emergency animal service in your area. Do not delay professional care based on calculator or search results alone.
Pet poison hotlines (24/7, US and Canada):
ASPCA Animal Poison Control Center: (888) 426-4435
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Pet Poison Helpline: (855) 764-7661
Pet Poison Helpline states its service covers the U.S., Canada and the Caribbean. The ASPCA line is also used by Canadian pet owners. A consultation fee may apply to both. In Canada, your nearest 24-hour emergency vet clinic is the best first call; elsewhere, use local emergency veterinary directories.
How we calculate results: This tool uses commonly referenced veterinary toxicity thresholds and food safety guidelines. Actual toxicity can vary based on your pet's size, health status, and exact substance consumed. These results are estimates only and do not replace a veterinary assessment.