Food safety
Can dogs eat nuts (general)?
Yes, but be careful
High in fat, easy to choke on, often salted. Macadamias are toxic. Best avoided as a habit.
Being honest about this
Dogs differ, and amount matters — a crumb of something rich is not the same as half a packet. Treats of any kind should stay under a tenth of what your dog eats in a day. If you're unsure, your vet would far rather take the call.