Food safety
Can dogs eat raw potato?
Yes, but be careful
Green or sprouting potatoes are toxic. Plain cooked potato without butter or salt is fine occasionally.
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.