arent most dog attacks done by golden retrievers and then followed by german shepherds?
Depends who you ask, really. The most often quoted bit of "statistics" comes from the CDC and/or Merritt Clifton, but both reports are based on limited data from inaccurate sources like media. CDC even stated in their study that the statistics don't mean much of shit because it doesn't take into count the population of each breed and the sources of the information aren't dog experts thus are more likely to give incorrect data.
http://www.atts.org has some interesting statistics on different breeds. It's basically a few tests meant to test the "stability" of different dogs in different situations. AmStaff/APBTs have one of the highest scores.
tested pass fail percent passed
AMERICAN PIT BULL TERRIER 665 567 98 85.3% ("pit bull")
AMSTAFF 570 478 92 83.9% ("pit bull")
CANE CORSO 85 69 16 81.2% ("pit bull")
DOGO ARGENTINO 11 10 1 90.9% ("pit bull")
GERMAN SHEPHERD DOG 2929 2,452 477 83.7%
GOLDEN RETRIEVER 720 609 111 84.6%
All basically the same passing rate
CHIHUAHUA 38 27 11 71.1%
BORDER COLLIE 248 200 48 80.6%