2 cups whole wheat flour
1 teaspoon bone meal
1/4 cup cornmeal
2 tablespoons corn oil or soy oil
1/2 cup soy flour
1/4 cup molasses
1/2 cup sunflower or pumpkin seeds
1 - 2 tsp
1 teaspoon iodized salt
1 large egg mixed with 1/4 cup milk
Mix all dry ingredients in a medium sized mixing bowl, then Add oil, molasses, a dash of garlic and all but 1 tablespoon of the egg-milk mixture. Knead the soft dough a few minutes to make a firm dough, adding more milk if needed. Let dough rest 1/2 hour or more (refrigeration isn't necessary)
Lightly flour a counter top or other hard surface and roll out to 1/2 inch in thickness. Brush with remaining egg-milk mixture and cut with doggie biscuit shaped cookie cutter.
Bake on greased cookie sheets at 350F 30-35 minutes.
To make harder biscuits, turn off oven after baking, open door slightly and leave them in the oven overnight to finish crisping.
A Note about the Garlic - garlic, in small doses is considered to be Safe for dogs. There are reports that using garlic (which contains Thiosulphate can cause hemoytic anemia or liver damage, but garlic contains only Trace amounts of thiosulphate and a dog would have to consume HUGE amounts of this for negative effects to occur.
View this Holistic Vet's View on Garlic for Pets
If you're concerned about this, omit the garlic altogether.