Hi Lorraine,
When dogs are confused about their role in the family it can lead to all sorts of behavioural issues, including the one you describe. You can absolutely this dog but it’s really all about working on the relationships he has with the people in his family, so sending him away to a behavioural school will not do that. It’s actually really easy to implement the information to help your dog start to relax, it just needs to be relevant information delivered calmly and consistently.
When you have guests coming over try having your dog on-leash and with you and ask your guests to delay greeting him until he is totally calm. If he reacts then calmly remove him from the room until he is quiet and then bring him back into the room, repeating the process if necessary. The aim is to show him that the wrong behaviour will mean he ends up on his own, but the right behaviour means he gets to stay. It’s best not to give him commands or speak to him during this process, allow him the mental space to think and process the information you are giving him.
My website TheOnlineDogTrainer.com shows you very clearly how to achieve a calm and happy dog…maybe take a quick look…we have a great trial offer on at the moment…All the Best, Doggy Dan