You have to differentiate between killings/maulings and relatively simple bites, as there is a world of difference.

Some dogs will bite in fear or warning, and then back off. Others continue the attack to the death. Pits and Rotts fall into the second category, to the tune of two-thirds of the fatal U.S. incidents.

But most of the problem falls back on the irresponsible breeders and owners.

Sue