Put the dog food kibble in a food processor or blender and grind to a coarse flour.
Measure 1/2 cup after grinding.
In a large bowl, combine ground dog kibble and the remaining ingredients until well mixed. The batter should be like a slightly grainy cake batter.
Grease or line muffin cups with paper baking cups. (Avoid foil baking cups; paper ones are digestible, so there's no danger in case your dog accidentally eats one, but foil could cause problems,) Pour the batter into the cups, filling each 1/2 to 2/3 full.
Bake 15 to 20 minutes or until golden brown. (The baking time may vary, depending on the type of dog food and fullness of the cups)
Remove pupcakes from oven, allow to cool thoroughly, and store them in an airtight container.
Store in refrigerator.
Optional: Frost with a thin layer of whipped cream cheese. Sprinkle with a few jimmies, ground dog food, or press a couple of blueberries into the frosting.