Call St John's County Sheriff Florida and demand Sgt Emmet be trained on the law and reprimanded for violating citizens rights.
Note how the story changes from "you are interfering with a criminal investigation" to "it is dangerous for you, our dog might turn around and bite you" (unintentionally admitting police dogs are a danger to the public).
Note the smirk when he's called out for interfering with the cameraman capturing the scene, because that's why he stopped him, to interfere long enough that he couldn't capture the scene, proven by the fact that he walks away once he's made the reporter miss the shot.