Preheat oven to 350ºF and spray a 7" cake pan with coconut oil.
In a bowl, mix together 2 cups peanut butter, applesauce, eggs, and baking soda until combined. Pour a third of the batter into 7" cake pan and bake for 35-40 minutes, or until cake is set. Remove from the pan and refrigerate until ready to use. Repeat with remaining batter to create 3 layers.
When ready to frost, whisk together cream cheese with yogurt and peanut butter until a thick frosting forms. Layer cake and frost generously. Garnish with dog-friendly fruits and vegetables.