okay, I am going to chime in now!!! When we first got Turbo (westie) he had major problems too. We put him on some products called Nzymes (
www.nzymes.com) used to clear up yeast. They also suggest foods that are good for yeast prone dogs and foods to avoid. Potatoes are a food to avoid if your dog is yeast prone. Turbo got better, but not cured with these products. I ended up putting him on Atopica a non streroid perscription and he is pretty much itch free. Atopica is not cheap, but him not having itching fits and losing his hair is a big improvement. I know it is hard having dogs with problems, but they so need our help. They can't help themselves.
Also, I would try a grain free food. That might help. That website suggests some really good foods. good luck and hope this little bit helped.
Oh yeah, you can try local raw natural honey. It helps with allergies, as does organic apple cider vinegar in their water. good luck!!
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Jennifer, Proud mom to Micah

, Candy

, Nikki

, Gizmo

, and Crickett (gone but NEVER forgotten)