Well the prescription diet did help
Ranger had his first normal poop in a week. He seems to absolutely love the food, which leads me to believe it must be the McDonald's of dog food. Two weeks, that is what the vet said. Two weeks of nothing but the prescription dog food. Maybe I should keep track of his blood work and vitals and write a book like the guy who ate nothing but McDonald's for a month.
Hopefully this will get his system back on track and I can quickly switch back to a decent food.