Also, I would recommend "Click to Calm" by Emma Parsons…and just about anything by Patricia McConnell. You can find these books at dogwise dot com You CAN learn to change Benny's behavior yourself, but it would really help to have a behaviorist help you. You wouldn't really have to risk a lot if you learn exactly what techniques you prefer to use, and then interview people about their preferences. After you do some research, it should be pretty easy to tell who is thinking the same way you are, and whether or not they can help.
Did you try Northcoast Dogs? their website is that name then dot com