Dogs can eat bananas, but they should not eat banana peels. Banana peels are not toxic to dogs, but they are very high in fiber and hard for dogs to digest. Eating banana peels can cause vomiting, diarrhea, constipation, or even dangerous intestinal blockages that may require veterinary attention. Additionally, banana peels could contain pesticide residues that might make dogs sick. The safest choice is to feed dogs only the soft inside part of the banana and avoid giving them the peel at all costs. If a dog accidentally eats a banana peel, it is recommended to monitor them carefully and contact a veterinarian if any symptoms of distress such as vomiting, diarrhea, lethargy, or abdominal pain appear.