The year 2008 suggests an older release. If no legitimate media matches that description, the file is likely a re-packaged collection of unrelated clips or a malicious executable pretending to be a video file.
Use MediaInfo (free tool) to analyze your broken file. Look for: Download Fixed -18 - Dog World -2008- UNRATED English
According to the upload notes accompanying the file (sourced from a private tracker), this "Fixed -18" version restores approximately 11 minutes of footage not found in the standard 2008 release. Included scenes reportedly feature: The year 2008 suggests an older release