Banana

Bananas are loaded with vitamins and minerals such as potassium but they're also very high in natural sugar.

Even dogs without an intolerance to bananas are likely to experience stomach upset, constipation, or other undesirable symptoms if they eat too many.

Bananas are often used in baked goods for both people and pets so be sure to check the ingredients in any doggie biscuits or other treats to avoid unexpected reactions.