Dogs can have sweet potatoes as long as the tubers are thoroughly washed, peeled, fully cooked, and served plain without any harmful seasonings. Cooked sweet potatoes provide a wonderful source of dietary fiber and vitamins that promote healthy digestion and immune function in canines. Avoid feeding dogs raw sweet potatoes, potato skins, or cooked sweet potatoes prepared with butter, sugar, or toxic spices like garlic. Moderation is key to preventing stomach upset or excessive calorie intake.