Definitely get your dog on GOOD probiotics like Dr. Stephen Langers from Swansons and digestive enzymes, no matter what else you do. Neither of the foods your vet has had you try are really all that good. What was your dog on before? It could very well be an intolerance to some or many ingredients in the food. It could be the grains, the meat source, or a number of other things, but the first thing I would try is something that is grain, potato, and chicken free. You can also try giving her a teaspoon of plain canned pumpkin, not pie filling, with each of her meals.
