I did not read anything in the OPs post about schutzhund, must have missed that, and I would not have replied.
I have been to trainers who claimed they only used positive reinforcement. (Body slams to get the Great Dane Puppy in a down position are ok though.)
My current trainer allows prongs and chokes, not head collars though. Will not allow killing the dog -- I am usually threatening to.
Other places I have been would not allow prong collars, but did allow head collars.
So, you just really need to call.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.