It is essential to remember that you must limit the number of treats you give your dog. So, if you do find a banana bread recipe that is dog-safe, you should only give it to your dog occasionally.
As a rule, you should avoid giving your dog anything with artificial sweeteners. These products provide no nutritional benefit for your dog, and some can make your dog sick.
Even the most standard banana bread recipes contain vanilla extract. Unfortunately, vanilla extract is toxic to dogs because of its high alcohol content.