Are Macadamia Nuts Toxic to Dogs and Cats?
By the VetVerdict team · Last updated October 18, 2026 · General information, not veterinary advice
Dogs
ToxicSeriousMacadamia nuts can cause weakness, vomiting, tremors, and elevated temperature in dogs, typically resolving within 48 hours with care, but still warrant a vet call.
Cats
Safe in ModerationMildMacadamia toxicity is far less documented in cats, but as a high-fat nut it's best avoided regardless.
A toxin nobody has pinned down
Veterinarians have documented a distinct illness in dogs after eating macadamia nuts, yet the compound responsible has not been identified. There is much less information about cats. The nuts are also very high in fat, which adds a risk of stomach upset and pancreatitis.
Cookies, trail mix and chocolate-covered nuts
Even a small number of nuts can affect a small dog. Macadamias often appear in cookies, granola, trail mix and chocolate-covered treats — the last combination layers a second toxin on top of the first. Salted nuts add sodium on top of that.
Signs to watch for
- Weakness, especially in the back legs
- Vomiting
- Tremors
- Elevated body temperature
- Lethargy or depression
Signs typically start within about twelve hours and, with veterinary care, most dogs recover within a day or two — but you should not assume that without checking.
What to do
Call your vet or poison control and tell them how many nuts, or what product, your pet ate. Keep your dog calm and cool until you have advice, as a raised temperature is one of the signs.
Safer alternatives
If you want a crunchy treat, a few pieces of apple (core and seeds removed) are a better choice than nuts.
Frequently asked questions
How many macadamia nuts are dangerous?
Reports vary and there is no precise safe number, so it is best to call your vet if your dog has eaten any.
Are other nuts safe for pets?
Generally not recommended. Walnuts and pecans can be a problem, especially if moldy, and many nuts are hard to digest or a choking risk.