This is the recipe I use - my dogs sit by the oven salivating whenever I make them.
Peanut Butter Dog Treats
2 cups whole-wheat flour (or all-purpose unbleached white flour)
1 tbsp. baking powder
1 cup peanut butter (chunky or smooth) (smooth is easier to roll out!)
1 cup milk
Preheat oven to 375'F. In a bowl, combine flour and baking powder. In another bowl, whisk together peanut butter and milk, then add to dry ingredients and mix well. Place dough on a lightly floured surface and knead. Roll dough to 1/4 inch thickness and use a cookie cutter to cut out shapes. Bake for 20 minutes on a greased baking sheet until lightly brown. Cool on a rack, then store in an airtight container.