Hmmm, I didn't consider the Doberman neck and the Gentle Leader....I will definately ask my vet about that.
I live in Los Angeles, where using a pinch or prong collar is so frowned upon that people will literally stop you on the street or at dog park to say something (it has happened to me). Everyone uses Gentle Leaders or Halties with their dogs here (other than regular collars and leashes)....which I hope at some point my Dobie will be trained enough to use (without taking me down).
But thank you for telling me about the concern with these types of collars with Dobies....I did not know this and I sure don't want to cause him any injury.