In another one of their "big" EXCLUSIVES, Yahoo! Sports claims there might possibly maybe who-knows? could be a video of Ron Mexico involved in dog fighting. The story isn't much of a smoking gun, but it keeps the ball rolling, and it allows for fun Photoshops like above.
No matter what, if Vick was involved, his experiences like went something like this.
Videotapes Sought Of Vick Watching Dog Fights [Yahoo! Sports]
The Offseason Adventures Of Michael Vick! Episode 5: Dogfight! [Kissing Suzy Kolber]