I'll try to K.I.S.S.
*IF* they don't euthanize your dog, I suggest you IMMEDIATELY find a certified trainer/behaviourist, not neccessarily a purely positive trainer, but one at least with mostly positive methods and sign your dog up.
Keep him ON LEASH at all times to avoid more lawsuits. Even when he goes out in your fenced back yard, yes even then.
While your waiting the few days before your first class, (should be within a week, obviously this is a serious situation) research different training ideas and methods, like NILIF, some clicker websites. (You don't have to have a clicker to understand marking and rewarding behaviour methods).
Good luck and BE SAFE!
