I don't know if you can get this product in the States, but it's called VIACUTAN and it's a great product.

It helped Beans a lot - She always had dry skin and what looked like dandruff.




Viacutan

Essential fatty acids are nutrients which cannot be made in the body and have to be provided in the diet. They are essential for the formation of new cells ant to keep the skin in good condition.
Viacutan uses the GLA (gamma linolenic acid) essential fatty acid and is a balanced combination of plant and fish oils providing very high levels of biologically active GLA to be used as a dietary supplement to help condition the skin in dogs and cats.
From here: http://www.petvetcare.co.uk/acatalog/Skin.html