Caveat: I'm no expert.
In shows I've seen on TV about wolf behavior, they show their submissive behavior by rolling on their sides or back and exposing their neck. I've never seen (that I recall) a dominant wolf attacking another in such a position. They don't seem to regard it as a suicidal action, but a sign of respect.
In "The Dog Whisperer", Caesar often puts dogs on their sides or backs when they don't respond to lesser methods. He doesn't yell at them, he doesn't hit them (but will poke them to get their attention). He uses what they understand as alpha behavior to impress upon them that they're not the alpha. He raises and trains dogs and has a specialty in pit bulls and rotweilers. He certainly [link|http://www.signonsandiego.com/news/features/20041017-9999-lz1a17beast.html|seems to know what he's doing].
FWIW.
Cheers,
Scott.