I'm going to guess that you don't have a truly genetically dominant dog and that the dog has learned to take advantage of your handler inexperience. The first clue is that you have a white GSD. While I suppose it is possible that a white GSD could be genetically dominant, I think the odds are low because of the focus of breeding being primarily on coat color and not strong temperament. True genetic dominance has value in the right amount and in the right hands when the dog is being trained in bite work because the right amount of dominance can add power to the bite work. You probably have what you would see on every episode of Cesar Milan's old show, where the dog has taken the leadership role because of the handler. It is also revealing that the person who assessed your dog as dominant and then recommended a gentle leader. A gentle leader on a truly dominant dog is ridiculous. The person in the schutzhund club sound like she gave you bad information and an inaccurate assessment of your dog. I seriously doubt your dog had any good foundation training where food and or prey drive were used to shape behaviors and increase your dog's motivation to be obedient. The pink spot on your dog's nose is likely related to his white coat/pigment. You most likely have a persistent, challenging dog with no foundation training paired with an inexperienced handler. Seriously dominant GSDs can send their handler, even experienced ones, to the hospital. Your dog likely waits four seconds to follow a command because he wasn't provided a motivational foundation. When that occurs, if the dog knows the command and is still hesitant, he gets a fast sharp correction on the prong, but that takes timing and skill and requires experience. Many sport trainers looking for very fast sits and downs still give prong corrections even though the dog had a proper foundation and knows the command. They are punished because the command is followed too slowly. It is not a brutal correction and the dog is not phased. Plus, dogs that have never received proper corrections early often act like they are being killed and get reactive because they have not learned from an early age that a prong correction will not kill them and they manage to work through it, unless they have significant temperament issues. Biting at 8.5 months is common and there are different ways to deal with it, and it will go away with maturity and correct handling. The other good news in addition to not having a truly genetic dominant dog is that you described your dog as social and not dog aggressive, with decent nerves. You are going to have to get some help from a competent trainer, which obviously, is not that easy to find. Then you need to go back and work on foundation training using food and a toy if he has decent prey drive, as well as positive punishment with a prong collar. the problem, I'm guessing, is that you don't have the skills to know what to do. Knowing how to correctly size and use a prong collar takes experience. The problem is fixable, but you need the right help and so far, it sounds like you have received incompetent evaluations of you dog and bad advice. In one photo it looks like you have a harness on your dog, which allows you no control over the dog and gives him a greater advantage in disobeying you.
Last edited by Chip Blasiole; 10-17-2019 at 01:40 PM.