Take a larger mixing bowl and place 2 cups of whole wheat flour. Pick up fresh apple, wash it properly and dice it into to equal small pieces. Add the pieces to the whole wheat flour in a mixing bowl.
Add in one unbeaten egg, 1/3 vegetable oil and ½ cup water. Mix all these ingredients until well blended. Keep mixing the ingredient until a stiff dough form.
Roll the dough on a floured surface to a desired thickness. Garb a cookie cutter and cut the dough into 2 to 2 1/2 dozen medium pieces. You can use different cookies cutters for different sizes and shapes of the biscuits. If you do not have a cookie cutter and you are an expert in arts, you can cut the dough in different shapes with the help of a knife.
Place the pieces on a greased cookie sheet and put it in the 350 degrees pre heat oven. Bake them for approximately 35 to 40 minutes. Turn off your oven and leave the Apple Dog Biscuits inside overnight to harden thoroughly.
Take out the biscuits early in the morning, place them in an airtight container, and store them in your refrigerator or freezer.