Yes, dogs are allowed to have bananas as an occasional treat. Bananas are safe for dogs to eat and can be a healthy snack in small quantities. They contain beneficial nutrients like potassium, vitamin B6, vitamin C, fiber, and magnesium. However, bananas should be given in moderation due to their high sugar content, and the peel should be avoided because it is hard to digest and may cause stomach upset or blockage. Bananas are not toxic to dogs, but the recommended portion size depends on the dog's weight. Too much banana can lead to digestive issues like upset stomach or diarrhea. It is best to peel the banana and cut it into appropriate-sized pieces before feeding. Bananas can be especially good as a low-calorie treat or training reward. In summary:

• Bananas are safe and healthy in small amounts for dogs.
• Avoid feeding banana peels.
• Feed peeled bananas in moderation to avoid digestive upset.
• Portion size varies by dog size, with small slices given to smaller dogs and more for larger dogs.
• Not suitable as a main diet item but fine as a treat (only 10% of diet from treats).

These points are supported by pet experts and veterinarians from sources like Purina, the American Kennel Club, and PetMD.