I just returned from a business trip for 10 days and my poor dog is infested with fleas..she has bitting and scratched her skin raw on her hind legs and near the base of her tail...Her skin looks horribly dry, has red blotches all over and her hair looks so thin and frail all near her hind legs.. the first thing I did was give her a good flea bath, treated her with advantix and called a exterminator..Im not too sure what I can do to help with the skin and for her hair..any suggestions...this is what I get for leaving my dog with a sitter!!