Saw W5 too. For anyone who wants to view "Bred to Bite" as shown tonite you can access it at CTV's website:
Its very sad that there are people out there who would breed dogs like this on purpose.
I know a lot of people have really nice dogs of these different breeds they were talking about, and that any dog could bite, but they had an expert on the show who mentioned the common statement "it's not the dog its the people that own them" and her opinion was that it wasn't always the people and that there are people that have done everything right and still end up with an aggressive dog.
A big point of this story was to caution people about getting some of these "muscle" breeds. The fact that they are dangerous is not all a myth. It isn't always just the people that own them that make them dangerous, the breed can just be dangerous period.