Cashews — Food safety facts
Feed with care · Dogs · full breakdown on the linked food page
Not toxic but very high in fat. A couple of plain cashews are fine; salted or chocolate-covered ones are not.
Short answer
Yes, a few plain cashews are generally safe for dogs if given in moderation. They are not toxic but are very high in fat, so overfeeding can cause stomach upset or pancreatitis. Offer only one or two unsalted nuts at a time and watch for vomiting, diarrhea, or abdominal pain. If any of those signs appear, give your vet a call.