I believe this is the movie you're talking about...

Off the Chain - Pit Bull Underworld



Quote Originally Posted by [url
www.doggienews.com][/url]
"This film goes inside the belly of the beast, and the beast isn't the pit bull terrier, it's man. This is the ultimate betrayal of man's best friend. The director exposes the fastest growing crime in America -- dog fighting. "OFF THE CHAIN" is a horrifying glimpse into the world where the special relationship between man and dog has been perverted. It will grab you and shake you, and hopefully it will stir you into action."