Sherry, this has to be sooo hard for you. You asked for advice and I guess since this is such a hard hard situation we all see it from different aspects. First off I want to say, no matter what any of us think, YOU are the one who makes the dec. about what is going to happen to petra.
Someone mentioned Amitriptylene, that is actually a meds. for people with depression. I have heard of it being used for dogs, but dont have any experience of that myself. If that is something you have not tried, maybe that would be something to look into.
We all have different opinions in this, and since it is such a terrible situation for you Sherry, I cant even imagine having to be in that one. I want you to know that whatever you decide, we are behind you, YOU are the one knowing Petra and after collecting facts about the training and the trainers, maybe, hopefully you can come to a conclusion that feels okay in both head and heart. Meanwhile we are here to support you, NOT to point fingers, no need to pour salt in wound.
Hugs
Marit