The outer health of your dog relfects his inner health. An oily coat, dandruff or even a greasy tail is an outward sign that your dog is trying to rid itself of toxins. Giving your dog a bath just isn't going to get to the root of the problem.
Did you know that the skin is the largest organ of the body? It also serves many functions. It guards your dog from the heat, cold, injuries and regulates their body temperature. The skin is the first defense against infection and is important in sensory perception and gives your pet a lot of information about his surroundings.
A little oil is normal, but too much oil which can manifest itself as an oily coat and greasy tail can be signs that your dog has a waste disposal problem which can be related to his liver or kidney.
Vitamin B supplements are a great source of good skin nutrition because it stimulates elimination and helps the body dispose of waste through the proper channels.
Again, remember than when your dog is not well, he becomes stressed and even anxious and the behavioural issues come into play. Once you start taking care of your dog holistically (mind, body and spirit) you will begin to see the dramatic changes and the stress and anxiety becoming less of an issue.