I think a dog behaviorist should be consulted. They will give you the right tools to work with.
As for you being invisible to him when he's in these frenzies, you are. Terriers have tunnel vision when it comes to prey or like your guy protecting his family, they hear nothing because they are so focused at doing their job.
__________________ Joan, mom to Cody  RIP Matese  Schnae  Kajon Kia  forever in my  A House Is Not A Home Without A Dog |