...trained to attack?

All answers is yes.

They are neutered or spayed and that does mean that they can also be female. They are sent to school with there handler. The training to attack or protect is called scholtzen it is German.

Yes They are neutered and spayed, a female in heat could get in the way of work, same with a malethey are both most that ive seen have been female actually.Girls are just tougher =)