Preaheat Oven: 400 degrees
Grease or spray cookie sheets

Combine wheat and soy flour, baking powder and salt in mixing bowl.

In a separate bowl, whisk together peanut butter and milk until well combined and smooth. Fold peanut butter-milk mixture into dry ingredients and mix well to a soft dough.

Turn out dough onto lightly floured surface; knead lightly. Roll dough out to 3/8 - 1/4 inch thick; cut into pieces 1-2 inches square (depending on dog's size). Place 1/2 inch apart on ungreased baking sheets.

Bake 15 minutes or until lightly browned.  Remove from baking sheet and transfer to wire racks to cool.

These treats are best stored in the refrigerator.

Storing Dog Treats
In general you should store dog treats the same way you would homemade people cookies.  That being said, there are two main variables that determine storage time - the amount and type of fat in the recipe and your local weather conditions.  If your recipe uses fats such as butter, or meat bits or juices then it will be more prone to rancidity than a recipe that uses some vegetable oil or shortening.  Your treats may mold or spoil much faster in humid or very hot climates. 

Refrigeration and Freezing -  Refrigeration will prolong the life of more fragile dog treats. Make sure to store in a tightly sealed container or zip lock bag.  You can also freeze most treats in zip lock freezer bags.  Allow to thaw completely before use.