Yes, dogs can eat cucumbers safely in moderation. Cucumbers are mostly water (around 95-96%), low in calories, and contain some vitamins like K, C, and B, as well as minerals such as potassium and magnesium. They make a hydrating and healthy low-calorie snack that can be especially good for overweight or diabetic dogs. However, cucumbers should be served fresh, plain, and cut into small pieces to avoid choking hazards or digestive upset. Cucumber skin and seeds are generally safe, though some dogs may have difficulty digesting them, so they can be removed if needed. It is important to feed cucumbers only as a small part of the diet—typically less than 10% of daily calories—and to introduce them gradually to watch for any adverse reactions like upset stomach, vomiting, or allergic responses. Pickled cucumbers (pickles) should be avoided because they contain salt, spices, and other harmful ingredients for dogs. Before offering cucumbers, consulting a veterinarian is recommended to ensure it suits the dog's overall diet and health condition.