I was limited to that area due to the way the dog was positioned and safety factors. That caused the dog to drop the other dog , however, he was mobile. The other neighbor put either 6 or 7 9mm rounds into him, through his ribcage. That finally dropped him. I suspect his rounds probably hit his lungs. Your mileage may vary.
Hundreds of examples of Pit dysfunction here:
http://www.olathepsc.org/c/opsc/attacks2006.aspx
Looks like Law Enforcement is having to blow away these sweet babies on almost a daily basis.