Yes bananas are good for dogs to eat.
Bananas are high in potassium, vitamins, biotin, fiber, and copper which is healthy for dogs and the dog will see improved health when eating bananas.
Just don't give the dog too many bananas because the dog could get diarrhea because the fiber in the bananas.
But in moderation the bananas are a healthy low calorie treat for the dog.
My dog eats bananas once in awhile as a treat.
I don't make it a habit to give the dog too many bananas but I save the bananas as a treat for the dog.
The bananas are healthier for your dog than other dog treats.
Bananas are also very healthy for humans as well.