Are bananas safe for dogs is not a common question I get. But like almost all other foods bananas are safe for dogs in small quantities. Bananas are high in potassium, which in excessive amounts can lead to heart damage and cardiac arrest.
However , your dog would have to eat a large number of bananas for this to happen. In fact I do not know for a fact what is the limit on how many bananas a human could eat before experiencing any side effects, it would probably be more than you could eat.
Bananas have been used to make homemade dog treats and contain a good amount of healthy vitamins and minerals to help your dog.
Bananas probably fit in the same category as onions and garlic although not quite as toxic.
Onions and garlic are often used in dog treats and dog food to add flavor and make them more palatable. However , in large amounts the raw form onions and garlic can prove fatal for dogs.
Now bananas are not as deadly as raw onions and garlic but if you give them to your dog in small quantities there should be no problems.
Dogs also have a built-in safety mechanism called vomiting to help prevent them from eating too much as well. I would assume if they were feeling ill from eating a lot of bananas the vomiting reflex would kick in and they would eliminate any bananas from the stomach.
So the short answer to your question, are bananas safe for dogs, is yes, in small quantities.