Preheat oven to 400 degrees F. Grease cookie sheets. Mix whole-wheat flour, all-purpose flour, cornmeal, and oats. Add water, oil, eggs, peanut butter, and vanilla. Roll out the dough and cut into dog biscuit shapes. Bake for 20 minutes at 400 degrees F, then turn off the oven but leave the biscuits inside for another 20 minutes to harden.
Preheat oven to 400 degrees F. Grease cookie sheets. Mix whole-wheat flour, all-purpose flour, cornmeal, and oats. Add water, oil, eggs, peanut butter, and vanilla. Roll out the dough and cut into dog biscuit shapes. Bake for 20 minutes at 400 degrees F, then turn off the oven but leave the biscuits inside for another 20 minutes to harden.
While commercial dog treats rely heavily on chemical preservatives and shelf-stabilizing agents for extended warehouse storage, baking these biscuits at home allows absolute control over every single component entering the mixing bowl. Making this dough requires managing moisture carefully, because whole-wheat flour and rolled oats absorb liquids differently than refined white flour depending on ambient humidity.
Freshly baked items lack the synthetic mold inhibitors found in mass-produced alternatives, meaning proper dehydration is mandatory for shelf stability. Thorough cooling on a wire rack prevents condensation from softening the bottom crust before storage.