Bananas can be a safe and nutritious snack for dogs in small amounts. They contain potassium, fiber, and other essential vitamins and minerals that can benefit your dog's health. In some cases, bananas can also help firm up stools and relieve symptoms of mild diarrhea. However, it's important to only feed bananas in moderation, as too much can lead to digestive upset or an imbalance of other nutrients in your dog's diet. In addition, some dogs may be intolerant to bananas and may experience digestive upset after eating them.