Step 1: Pre-heat oven to 375 degrees F. Spray a standard 8 inch round cake pan with non stick pan spray.
Step 2: In a large mixing bowl, whisk together the flour, baking soda, and salt. Add the oil, egg, peanut butter and smashed banana and mix with a wooden spoon.
Step 3: Add in the water as needed to make the mixture the consistency of a typical cake batter.
Step 4: Pour the batter into the round pan and bake for about 40 minutes. Remove cake from pan and allow it to completely cool before icing.
Step 5: Doggie Cake Icing:
Microwave the yogurt chips for 2-3 minutes, stopping every 30 seconds to stir. Once chips are completely melted, pour it over the cake and spread with a spatula. Use the kibble to write your dog's first initial. Allow to harden (should take about 30 minutes).