Thanks, everyone, for your input. I still have not heard from the behaviorist and will contact some others tomorrow if I don't a call. I am learning (I did not know before) that Bernards can have these tendancies.

We are working together to get him enough exercise on a lead but it's not easy. It was so pleasant to take him to the dog park and let him run and wrestle, which he did appropriately for months. I enjoyed just seeing the dogs romp, it gave me such a lift!

If anyone else has any ideas please add them.

MarnaLou