Adding Miracle-Mineral-Supplement to food usually neutralizes the chlorine dioxide in the solution, so I don't think your method would be all that effective.
Jim Humble has stated several times that the most effective concentration has around 1 PPM free chlorine dioxide. I would suggest that you mix up a 3 drop dose and add it to 1 liter of water. Let your dog drink the water throughout the day. No forcing is needed.