3 1/2 c. all purpose flour
2 c. whole wheat flour
1 c. rye flour
2 c. bulgur (cracked wheat)
1 c. corn meal
1/2 c. instant non-fat dry milk powder
4 tsp. salt
1 envelope active dry yeast
1/4 c. warm water
3 c. chicken broth
1 egg, slightly beaten with 1 tsp. milk

Preheat oven to 300 degrees. Mix the first 7 ingredients with a wooden spoon in a large bowl. Dissolve yeast thoroughly in warm water in glass measuring cup. Add to dry ingredients. Add chicken broth to flour mixture. Stir until dough forms. Roll out dough until it is 1/4 inch thick. Using a large dog biscuit model, cut out bone shapes from the dough. Place on prepared cookie sheets. Brush dough with egg glaze.

Bake at 300 degrees for 45 minutes. Turn off oven. Bones should remain in oven overnight to harden.