A dog that has a high chase drive cannot be re-routed once it has started the chase. According to a book I'm reading "STOP" Predatory Chasing in Dogs (can't remember offhand the name of the author, a police dog trainer from England) The author makes an analogy that humorously compares the dog on a chase to a soccer player getting ready to score the winning world cup goal, and then you tell him you will give him a cookie if he stops running. The author suggests removing all the things that would be available to the dog to cause it to chase, or removing the dog from a potential chase scenario if possible. Of course that would involve a responsible dog owner willing to make the effort.