Make Your Own Dog Biscuits
1. Position a rack in the center of the oven. Preheat it to 250 degrees F. Place Dog Biscuit Mix ingredients in a medium sized bowl. Add in 1 large egg, 1/2 cup shredded sharp cheddar cheese, 1/4 cup grated Parmesan cheese, 1/4 to 1/2 cup (or more) hot chicken broth, beef broth or very hot water.
2. Make a dough that's very heavy, but not sticky. Add more flour or water, 1 teaspoon at a time if dough is too moist (use flour) or too dry (use hot water).
3. Turn out dough onto a floured pastry cloth and knead 8-10 times until elastic. Let dough rest for 5 minutes. Roll out dough 1/2 of an inch thick and cut with a dog-bone shaped cutter. Place cookies close together as they will not spread.
4. Bake for 1 hour, rotate the baking trays in the oven (turn tray around 180 degrees), and bake them another half hour. Cool the cookies in the pan for 1 minute, then transfer to a wire cake rack to cool completely.