I have both of my girls on NB LID,the duck and potato one. They also have little treats in the same formula that they seem to love
They used to itch and be flaky, with weepy eyes and just plain icky poops, until we stumbled upon the NB LID stuff. I think a lot of dogs are allergic to the corn in some foods, RC is chock full of it! We tried that one, Solid Gold, and some others I can't remember right now, but the NB has worked best for us.
Hang in there, I know you're frustrated, it's a PITA
It may take a few weeks, also, to see any change after switching foods. If you email NB, they'll send you samples so you can see if your baby will eat the food. Good luck!