No — dangerous
No — macadamia nuts are specifically toxic to dogs, even in small numbers. They cause weakness, tremors and overheating. Watch out for them in cookies and trail mixes.
Macadamia nuts are unusual: unlike most nuts that are merely fatty, they contain an unidentified toxin that affects dogs directly. As few as a handful can cause symptoms in a medium dog, typically within 12 hours. The classic sign is sudden hind-leg weakness, often with tremors and a raised temperature. Dogs usually recover with prompt care, but it is frightening and avoidable. Macadamias hide in cookies, white-chocolate treats and nut mixes — a double risk if chocolate is involved too.
None. If your dog eats macadamia nuts, call your vet — they may want to see your dog or advise monitoring, especially if chocolate or raisins were in the same treat. Note roughly how many were eaten.
Skip nuts as dog treats generally; a smear of xylitol-free peanut butter is the safer nutty option.
General information, not veterinary advice. If your pet has eaten something potentially harmful or shows symptoms, contact your vet or an emergency clinic immediately. Full disclaimer.