More than 86% of fatal dog attacks are done by this kind of dog:

[defacto7]

49. This is a very good post and article.

Thanks. It's true for the most part but I would not underestimate the aggressive behavior of an alpha bitch. (sorry to those who are sensitive but this is the proper usage for the word.) In a pack with pups, the alpha bitch can be THE most aggressive over any pack males neutered or not, but that is usually when she is approached or there's a perceived attack or attack stance; they will protect their pack and pups. Sometimes that continues after the pups are gone, they can become the leaders of the pack. The two most aggressive dogs I have ever had in my care were over-bread alpha bitch show dogs, but that's not the norm.

I think the article is true in the vast majority of situations probably due to domestication. City dogs can be different than country dogs too, but that's another long story.