Instead of buying a box of dog biscuits that have all types of unnatural ingredients, you can easily make your own at home. To do so, you'll need:
2.5 cups of whole wheat flour
1 tsp. beef or chicken broth
0.5 cup of hot water
0.5 tsp. salt
Mix-ins (think bacon bits, oats, wheat germ, or shredded cheese)
Preheat the oven to 350 degrees. Heat the beef or chicken stock on the stovetop until boiling. Add in all other ingredients. Take the dough that is created and knead it into a ball. Roll the dough out to about one-half inch thick. You can cut out basic shapes with a knife or you can use cookie cutters to make fun shapes. Put your dough on a lightly greased cookie sheet and bake for 30 minutes. Allow to cool before serving to your Shih Tzu.