Dogs can be great friends or frightening adversaries. In dreams, the friendly dog may be a representation of a trustworthy relationship or intuitive affirmation of it. The wild dog may represent a nagging, ongoing struggle with a seemingly irresolvable conflict. (Of course, either case may just be a replay of a life situation starring a real dog that you know, either friend or foe.)
Do you want someone who is unfairly persecuting you to "call off the dogs"?
Is there a relationship in your life where the loyalty is at question or is especially pronounced?