Is your dog afraid? Is he aggressive? Does he bark? Is he dirty?
The list of behavior problems of a psychologically unstable dog is long... Even worse, you have already sought the help of a trainer and nothing has changed? So your dog is condemned to a drug treatment for life unless someone has decreed that the only solution is to inject him? Stop!
First of all, I propose a complete behavior evaluation at your home
First of all, I propose a complete behavior evaluation at your home to identify the causes of the problem. After that, I tell you how you can save the situation. Most of the time it comes down to a misunderstanding and/or a poorly established relationship. Understanding your dog and having a well established relationship with him are fundamental elements.
As long as you follow my exact recommendations, I guarantee the results. It is a matter of complicity, a team effort carried out by you and me.
Usually this behavior based work is associated with training/reeducation or private lessons.