I saw that my dog have problems with his skin. He scratches it and I see that in those itchy places skin is very dry and with dandruff. I red many articles about such problems, also called my friend who is veterinary doctor. He said that my dog might developed deficiency of vitamin A and E and also I should give him supplements with omega 3,6,9. I'm looking for some products online, maybe you tried one of these products in this article and could recommend me something?