Preheat your waffle iron to medium heat. Don't use butter or cooking spray since the applesauce provides enough moisture.

In a medium bowl, whisk the egg until smooth. Add the applesauce and stir until well combined.

Gradually fold in the oat flour, stirring just until a thick batter forms. The consistency should be slightly thicker than pancake batter but still spreadable.

Spoon about 1/4 cup of batter onto the center of each waffle section. Don't overfill as the batter will spread as it cooks.

Close the waffle iron gently and cook for 3-4 minutes, until steam stops escaping and the waffles feel firm to the touch. They should be golden brown.

Transfer the cooked waffles to a wire cooling rack and cool completely before serving.

Break larger waffles into appropriately sized pieces for your dog's breed and size.