Whether you hair is short or long, you are going to want to use a conditioner in it when you wash it. It is going to not only make your hair more manageable and healthy, it is going to help to retain the moisture in your scalp and prevent hair loss.
If you are concerned about hair loss, don't over treat your hair with chemicals! Over treatment can damage your hair and make it more prone to fall out. Even the simplest treatment - like coloring your hair - should be done by a professional, so you can be sure there isn't any damage done, or you don't leave the product on too long.