Preheat oven to 325 F.
In a medium-sized bowl mix the flours, milk, and salt
Add pieces of margarine, lard or bacon fat, and cut with knives or pastry blender until mixture becomes the size of small peas.
Add sugar and egg, and gradually pour in water to make the dough stiff.
Turn the dough out onto a floured board or clean counter, and knead until it is smooth.
Use a rolling pin(or wine bottle) to roll the dough 1/2 inch thick. Cut the dough into dog bone-shaped treats using the bone-shaped cookie cutter.
Place the "bones" on a baking sheet and bake in oven for 30 minutes.
Remove the treats from the oven and let them cool. Then give to your dog and watch them disappear!