I can't hesitate to say that Krysalyss has given some excellant advice. There are a huge number of "trainers" or "behaviouralists" out there, unfortunately they don't all have the background or the study to help them. In Australia, there is only 1 form of accreditation and that is the Delta Society. So I would make sure I went through someone with that background. I have studied animal behaviour and specialised in dog behaviour, but for what you want, there is no way I'd give you advice here... I would have to come and work with you & your dog. It is something that does need work now.