Issue with a Great Dane Showing Dominance and German Shepherds reacting badly?

im not sure why you want the other dogs at a dog park to submit to your dog? if not that's how i took this as, and if he is showing aggressive tendencies then you probably shouldn't take him to the dog park...that's just asking for a fight between large dogs. i know great danes are lovers and not fighters but if hes being a jerk then you never know. also if it were MY dog that your dog was bopping around and you just letting this happen i probably would have alot of not so nice things to say at the park. that's being irresponsible to let him try to dominate the pack