[BrandoElFollito]

I wonder how much of a stereotype this is.

One usually does not hear about a labrador or a chihuahua killing its owner or a child. This is usually a pit bull, or another not so kind looking dog.

We had two dogs, all of them were from a refuge and were a mix of labrador and squirrel (or whatever was at the party that night). They were more of less intelligent, very friendly (we do not deserve dogs). I wondered how much they would become beasts in worse conditions, compared to z pit bull.

[ffumarola]

One of the problems is that people misclassify pit bulls all the time. Dog bites someone and looks like a terrier type? Pit bull!

There have actually been studies to show that the precision in which shelter workers and other professionals can identify a pit bull is startingly low and the error rate of mislabeling non-pits as pit bulls is surprisingly high.

[BrandoElFollito]

This is a good point.

What I really meant is that there may be some races (pure of mixed) which are more prone to aggressivity.

I think that, statistically, a mix of labrador & something vs. a mix of pit bull & something will be more dangerous - because of the pedigree.