Same thing happens to my Minature Poodle. Your
dog is
throwing up bile due to low blood sugar. As you know, when Cody throws up, there is no food in it, just fluid. This proves that his stomach is empty. With small dogs, they can become hypoglycemic very easily. I suggest giving a few treats before bed. Or, stop by your local pet store and pick up some Nutra-Cal - it is a sugar based thick syrup that also contains many nutrients.