I don't think the breed of dog necessarily means that much. Individual dogs that are bigger and stronger than a certain size have a higher potential to hurt people. To the extent that breed determines size, breed has some meaning. With people, the differences in size are not enough to have a big influence on the ability to do harm.
Yes.
Also the statistics of fatal and other attacks
will reflect the total population of a particular breed/type
relative to other breed/type populations.
Where I come from "pitbulls" and Rotties
are nowhere near responsible for the majority of attacks.
pdf link
To suggest that a breed/type is more dangerous
than similar sized dogs based on the number of attacks is a simplistic analysis
which ignores many other factors that contribute to dog attacks
and does little to help decrease dog attacks over all.