Hi scientist here, I actually ran a study during my cursus about this and i didn’t find any significant difference between ‘dangerous breeds’ and others. The literature I found confirmed this hypothesis. If you have an article confirming this fact i would gladly appreciate it. If necessary i can give you some articles to read. As far as I’m aware it does not appear to be a fact.
The NYC subway banned dogs on trains unless they fit into a small bag, so this guy trained his Pitbull to sit in a small bag. (suppo.fi)